Did you watch the press conference video the club posted? I was as concerned as you but, and it's not especially clear whichever way, it seemed like he was referring to the youngsters not being ready for the Premier League? I could well be wrong though.
Yes, I saw it after I posted Bidley. The key part of what he said for me was "knew from the start", the difference between "not good enough" and "not ready" is almost a mute point. And whichever way you see it a fair few will drop out of the main squad (George Williams for instance was pictured with the the U21s today).
As I said in the original post Felix seems to have been playing games and it's not a fit and proper way to develop our young talent.