I don't think he's quite right. Federer isn't as consistent as he was, his first serve has been wildly off in two slam finals (AO, USO), although dead on in the other two (FO, Wimbledon). I'm not sure how much the game has "evolved", that seems silly to me. In just a few years? Come on. There were enormous hitters, like Safin, several years ago. Federer had a positive H2H with Safin. There were other guys too. I think Federer is still in his prime, but definitely has declined from his peak. A few things are better. When he is on, his serve is better. His drop-shots are maybe better, although it is difficult to tell because he used them so rarely before. However, for the most part, most shots in his game are more inconsistent. Maybe his best tennis is as good as it has ever been, or even better (due to serve & drop-shot). But his ability to attain his best or near-best levels of tennis seemingly almost at will -- which he had for almost 4 years -- seems to have vanished. It used to seem like he could just summon his best tennis upon command.