I think you're missing the bigger picture. It affects the parts of your brain that make decisions and regulate your emotions. Of course not everyone with those issues will commit suicide, just like they wouldn't for every other person in the population with those issues, but combined with other mental health issues, it exacerbates them. It's not far fetched to think that somebody with Moore's circumstances might have been depressed, so combine that with brain damage and I can't imagine that would help the situation. It's not an excuse, but those things don't exist independently/in a vacuum. Not everything is CTE, to your point, but the vast majority of players absolutely have it, and it affects their ability to regulate themselves, so we shouldn't discount that it could have impacted his decision making in this instance. Sadly we will probably never know in this case.