A) A company that got rejected from YC's Early AI interview batch has figured out not to get rejected?
B) A company that got rejected formed a theory about why which absolves them of blame, and means that they do not have to ask how their application was weak?
I'm voting for B unless the rejected company has managed to put up a strong enough independent success signal that it is clear that they should have been accepted, and they don't just have sour grapes over not being accepted.
This goes doubly so given how much YC itself stresses personal qualities of the founders over the idea they started with. Trends in the ideas in companies formed therefore have more to do with what companies are pushed towards, by market forces or YC, than with the mix of starting ideas.