This season. 27 PPG is 9 points below his average. The strategy the Jazz employed is the only one that has limited him all season. The Bucks did the same thing and it was one of his worse games this year.
He's adjusted to that strategy but is clearly more uncomfortable when teams do this to him than he is when he's played straight up. Harden is one of the best if not the best offensive player ever. No one is going to shut him down. You have to limit him and the Jazz did that, their problem is they don't have any offense outside of Mitchell.