I'm not talking about metagaming your way into sekrit knowledge, Lord knows, nor godmoding somebody else's RP. I'm talking about a handwave that has the same practical effect as a bunch of other options; if you want to play that you hired a hacker, that's cool too.
is it not godmoding to dictate that NPC corporation X, has a system that can be hacked into, to create false records of employment ?
It is.
It is also a pointless claim. Why would you do that? To claim that [insert non-capsuleer faction you like here] trained you, but you can't show that In-game so you claim to have hacked the record to show some school you supposedly never went to as you employment? Supposedly you also hacked into their corporate channels and maintain this presence in said channels all the time?
Easier, and much more common, to simply claim being a plant from [insert faction]. Federal Navy Academy did indeed train you but your credentials and Id's were fake and you only let this be known when you graduated, because then the farce was no-longer needed as you returned home to Sarpahi for proper service? Or any other manner of less offensive ideas;
- You got a scholarship in the school and trained there before you left for your actual (not hostile to school's faction) nation?
- You decided early on you did not want to work for/serve/live in (insert faction) so you will, now that you have the freedoms of a capsuleer, leave for your new home?
- Make up some other somewhat plausible reason to have been trained in your chosen school?
Personally I generally don't take offense so long as people don't claim to be really special snowflakes and by-pass the whole process in such a cheap way as 'I hacked the school's systems, herpaderp'.