Is the issue that someone is using big non rp groups to dunk on things and that's being frowned upon IC?
No.
The issue is that a couple of organisations that don't post on the IGS much as a whole, have some people within it who do. And when those people came into conflict with others, the weight of those organisations were brought to bear. And people complained that it wasn't "true roleplay".
And other people are whining that everything was soooo much better back when dinosaurs roamed the earth, and wailing that organisations with the ability to easily whack the structures that CCP have made mandatory to have a war, as a whole, generally do not post much on the IGS. Dressing these whines up with enough IC flowery phrases as to pass muster on the IGS.
Stick a Fortizar somewhere as part of some RP thing, and it takes a fair amount of effort to destroy it. More effort than a big chunk of the organisations that heavily post on the IGS can reliably bring.
So those organisations bring in friends. But that doesn't work too well, when the Fortizars are in highsec, because of the suspect status for outside logistics, which allows others to intervene. So the only way to destroy a Fortizar without all the weird suspect things, is to have the assaulting party be big enough, which often means mercenary groups, who generally don't post much on the IGS.
A+B are at war, A has a highsec fortizar, B doesn't reliably have enough ships to assault it. So C offers to help. Now the A fortizar will fall to a B+C assault. But, the logistics will generate suspect status. Which allows D to intervene and attack B+C's logistics ships. Without which they can't take down A's fortizar. So, B can either, get everyone in C to abandon their corp/alliance and join B for the duration, or find group E which can bring a big enough single-corp force that the logistics won't go suspect and allow D to shoot them.
And if E aren't people who post much on the IGS, then A goes "lol B hired mercenaries, B are weak" and other such silliness.
So, in short, some people are having fun making things explode, and other people are whining that explosions were better in the past, and that people aren't having fun in the correct way, the correct way being what it was 15 years ago, not whatever the kids of today are doing.