I don't know what from what I said is not clear to you.People are claiming that his fh is fundamentally worse and that it's all about the racquet (as if nothing else changed between 2006 and now). You can listen to what Federer himself says about RF97 and particularly about the slice with it:
Federer played with a 90 si racquet. He could've gone for 93 or 95 (like Djokovic) but he has gone for 97. Think about it for a minute.