If you look at sack numbers as the sole proof otherwise idk what to tell you. His sacks have been a result of either coverage sacks or free on a stunt. (like today)
They have not come from beating his man one on one.
As a pass rusher he is having a horrible season. His pass rush win rate is 7.3 percent. That's horrible.
He's also been god awful against the run. He grades out as a bottom 10 iDL in the ENTIRE LEAGUE against the run. He is constantly dominated off the LOS and pushed back 5 yards regularly.