Overuse? Someone his size? Dude is built like a tank and works out like a mofo. It was a freak, soft tissue, non contact injury. He didn't get beat up from overuse. Bad take on Moore. Decent take on the need to translate hope into results.
I can tell you from experience & from science, working out like a mofo & going 100% all the time is what gets people injured muscles/ligaments. He needs to be protected from himself. Hamstrings, then that work themselves down into the knee, are usually from fatigue. Once it’s happened once you have to be really careful not to exhaust the hamstring again.