You are probably right but there is a big chasm between "probably" and "certainly" unless/until all information is disclosed. But as
@dad4 says, we don't know and we don't get to know. And I'll add, unless they choose to share. Here's the difference between us on this: I'm comfortable that a very logical conclusion may be there wasn't enough for the feds to prosecute and for ucla to fire. That may even be the most logical. But I know a little bit about how criminal investigations/prosecutions work and I know a fair amount more about employment hiring and firing decisions so I do know that feds may choose not to prosecute for various reasons independent of absolute guilt or innocence and I know a lot of employers that choose not to fire despite knowing that an employee has committed infractions. But - and please read this carefully - I don't know what happened, don't necessarily think that that happened and don't want any of that to have happened. But I'm not a child so I know that I want is not always the way things are and I also know that, even if it turns out I'm correct, it's never a good approach to be so certain about things when I don't have full and complete knowledge.
And still you don't address the pink elephant in the corner. How does a player get listed on the roster with a fake profile?