What are the odds that he'll call it 'Ye Combinator'?
I hope he does.
All I can say is he should go for it.
I'm not sure there's really a meaningful discussion to be had about a tweet. Not least because Y Combinator (in my opinion) isn't innovative in terms of its contract terms (although maybe someone can correct me - not sure anyone around here knows about that sort of stuff).
One thing to remember is the music industry is significantly different than tech when it comes to contract terms, and terms that look or work closer to tech for artists (even if they are worse in practice), could look radically generous compared to standard record label deals. It's also possible that Kanye wants to start something that looks completely different. You're right though, it's hard to decipher in a tweet