I guess whether he's been 'destroyed' is a subjective debate, but he's definitely been much, much less effective against OKC and Cleveland.
Here are his per-36 totals in the regular season:
14.5 PPG, 9.9 RPG, 7.7 APG and 55.1% eFG (average game score based on per game averages, 15.2)
Here are his per-36 totals in the last 13 games (OKC/Cleveland)
11.5 PPG, 8.6 RPG, 4.6 APG and 42.9% eFG (average game score based on per game averages, 11.3)
The issue here is that Dramond, as part of the 'death lineup' works well against teams that don't have bigs who can defend 1-5 on switches, but teams that he's running up against late in the playoffs are equipped to handle that. He's not been nearly as impactful against these teams.