Couple things.
Firstly - a lot of claims here seem to me to be founded on what I believe to be a vast misrepresentation of the order things happened here. Now, I could have it wrong, sure - but here's how I understood the order of things:
1- Anslo, Mizhir, Kyber and Kalo put together the initial report, based on what they could see through the ingame model previews for Artemis and Apollo. Additional extrapolation and detail was added by taking what they could see ingame and mapping it to what is known of the human body in the real world. This was discussed actively in Slack (minus Kalo, who doesn't use Slack to my knowledge) among other places, because Anslo was looking for other people with a medical bent (in or out of character) to work with him on it.
2- This report was passed around to a few people to give a quick preview of it, and then it was posted to the IGS. The people on Hydrostatic's recent "Entosis" lore panel were among the people to get a preview, because, iirc, Anslo decided to have it posted during or right after the panel concluded and there was interest in briefly talking about Drifter physiology during the panel.
3- CCP Falcon and/or Affinity and/or Delegate Zero then saw the final version of the report after it was posted to the IGS, either while perusing on their own, or from it being discussed on Slack or Twitter. This is the point that the devs chose to become involved. Not before, as some people seem to be insinuating. They may have seen it being discussed elsewhere before it was released but I certainly don't remember any commentary from them on it that would have been of any real use to Anslo and company.
4- The second report was written at the devs' request with a few hints or vague suggestions at what they might have found while doing an autopsy. This report was the basis of the Scope video last Friday. There was some correspondence at this point - as there should have been, since CCP asked for the second report.
Second - Slack is open to absolutely anyone who wants to use it. It is not a gated community in any sense of the term except by effort put forth on the end of the person wanting to use it. We actually passed the 1,000 member mark this past weekend - #999 and #1,000 were roleplayers, in fact. If you want to get access, you either can use the signup page (if it's working, it's a bit finicky from what I understand) or you can ask a member of the moderation team to send you a direct invite. There are 21 people on this team, which includes several CCP devs, as well as players from a wide variety of ingame entities and backgrounds (including, for reference, at least 2 or 3 users of Backstage - Anslo, Lucas Raholan and myself). All that's needed is an email address to send the invite to. (As far as retaining access to Slack goes, you have to more or less deliberately go out of your way to have that revoked. Kinda like OOC, Summit and Backstage - and I really do stress the deliberately bit.)
Third - has it occurred to you (or anyone else) that perhaps a reason CCP neglects direct interaction through the game itself is because of past bullshit? Not to mention how difficult it is to wade through the tens or hundreds of individuals all simultaneously screaming for attention from the Blue Text God that happens frequently when they hop into a channel - not just the RP community ones? It's pretty bad. If you haven't seen it happen, watch people trying to field questions from Twitch chat during a livestream. That'll give you a good idea of how bad it is. Now imagine it's happening in several channels at once - that's what it's probably like for people like Falcon or Logibro when they hop ingame. The signal to noise ratio is just too low for it to be a good platform for them. Slack, on the other hand, keeps track of people trying to reach you directly and periodically lets you know about it. It also allows you to walk away for several hours - or even close the app or browser - and come back and see what you missed. It is, in many ways, a superior platform to the EVE client.
Fourth - I kind of wanted to leave it alone, but I really can't resist: an MMO roleplayer who is averse to social media and yet wants special attention from CCP for things they're doing? Hilarious. If people are having difficulty coping with not getting attention because they're averse to using the best mediums for getting that attention... yeah, I'm gonna laugh. Sorry-not-sorry - either you want the attention and will do what you need to do to get it, or you don't and won't.
So, tl;dr:
1) CCP didn't get involved until AFTER Anslo and company posted to the IGS with their shit. Anyone trying to twist things to make it look like there was behind the scenes collusion and involvement prior to the release of the first report, knock it the fuck off.
2) It is stupidly easy to get onto Slack. So if you aren't on it and want to be, get off your own lazy ass and do what you need to do to sign up instead of making spurious and unfounded complaints about gated content creation or cool kids' clubs or whatever.
3) CCP doesn't actually get very deeply involved in discussions on Slack with any kind of frequency. Same with Twitter. Slack (and Twitter) just happen to be mediums that are far more conducive to their occasional participation or chiming-in than the EVE client is because it doesn't require them to put 100% of their attention and focus on it to follow and look for things they need or might want to respond to.
4) If someone genuinely wants the attention, they should do what they need to do to get it. That includes their chosen subject matter being interesting to others, as well as finding and using ways to get exposure for said subject matter. If you aren't willing to do that, you're gonna have a bad time.