This Chimp myth again.
Chimps are not 5 times, or 10 times or even 15 times stronger than humans, that is a known debunked myth, it spawned from a fake story in the 20th century.
Secondly Chimps may look tough when they beat up old ladies like that one known story, but they've never been in a position where they tried to attack an MMA fighter. There is a video where a chimp goes on a rampage on a terrified, fleeing park ranger and it barely was able to pull the guy down. In fact the chimp looked weak as fuck and I would see an MMA fighter tear that ape a new one.
Essentially the only thing dangerous about chimps are it's teeth.