How does Cunningham lead the NFL in tackles (both solo and combined), yet the Texans have the worst run defense in the league?

https://www.pro-football-reference.com/years/2020/defense.htm#defense::tackles_solo

https://www.pro-football-reference.com/years/2020/defense.htm#defense::tackles_combined

I can't tell if Cunningham is good or not.

Right now, Cunningham is on-pace for the 13th most tackles in a single season at 121 (tied with Ray Lewis) and 27th most combined tackles in a single season at 169 (tied with Jack Del Rio and Kurt Gouveia).