When one of the best park builders in the world (Jonas from Alpine), who loves an excuse to hate on skiers, comes up to me after a week of spring park filming with almost the entire Level 1 crew and says "Fuck, Wallisch is for real!  He might be the most impressive rider I've ever seen", it means something.  This is a dude who has been building photo shoot jumps for the best snowboarders in the world for a decade now and has literally seen everyone in the industry ride.
So in short, no, you're fucking retarded if you think he's peaked.  No one who actually knows anything about skiing would argue otherwise.