I think it has to do with the fact that a lot of fans see Steven's statement about disliking bands who tread on 70's prog to be a bit hypocritical while he himself treads on his 70's prog influences as much as Roine and the Flower Kings do on theirs.
Granted, the difference between SW and Roine is almost night and day, where as Steven is more of the King Crimson and Pink Floyd side of 70's prog, while Roine is more of the Yes and Genesis side of 70's prog, and while they all hailed from the hey-day of progressive rock music, they're still fairly different from each other.
Either way, his statement about TFK being the "death of progressive rock" or whatever seems odd, if he is referring to bands that produce the same kind of music that Yes and Genesis did back in the day, because he himself has created music, between Raven and HCE, that is fairly reminiscent of his 70's prog influences. I can't listen to most of Raven without thinking of King Crimson, and I also think of Floyd and even Rush when listening to HCE. Maybe *HE* doesn't see it that way, and he might not be very transparent about his influences on his music, but the fans will, and the fans will call him out on hypocritical statements.
-Marc.