There are professional athletes worth hundreds of millions of dollars who kept playing sports at the top level, even though they had no cartilage in their knees for instance. Or played through horrific injuries lunch as damaged or torn ligaments. Or even both, like Zlatan Ibrahimovic in his last AC Milan stint, played with no ACL and needed injections for knee pain. Luis Suarez is going to Inter Miami so he can play football with his old teammates one more time, even though he has an extreme amount of visible scar tissue on his knees from all the knee surgeries he got.

Professional athletes at the top are just at a different level. They will absolutely lie about concussions or convince their coaching staff to do so so they can play more. They probably already so in sports with concussion protocols.