There's nothing wrong with hitting two hands both sides, but if hitting with two hands on the forehand side, IMO you have to hold the grip as if it were a backhand on both sides (a lefty backhand and a righty backhand).
This guy's 'backhand' is awesome: great timing, fluent technically, and a nice early contact point. But all this seems to disappear on his 'forehand' wing. Because he keeps his hands on the grip as if he were hitting a right-handers backhand, when hitting the 'forehand' his hands are crossed over and his reach is restricted. He is already 'tied up' before making contact with the ball, and the simple fact of the matter is, a hard heavy ball is going to be trouble! In the video, he is able to cope on his forehand side because the guy is feeding him weak balls, but there's no doubt it's a different story if someones pounding groundstrokes to that side!
I don't really know NTRP ratings, but that forehand is definitely going to be exploited when playing at a high level. Having said that, the rest of his game is very solid, so it's possible he could prevent that shot from being attacked on a regular basis.