There might be a better source but expect the factual information here is a current as there is ...
https://concussionfoundation.org/CTE-resources/what-is-CTE
If I looked at this as parent with children who want to play contact sports am sure I would find it very disconcerting and would proceed warily if the decision was to go ahead.
Can see why the author wrote this article as it isn't as simple as playing contact sports or being in a combat until means CTE for sure at some future point but it does mean there is a risk factor that goes up as exposure is greater.
This pathologist, who has an important role in the field per the cite, seems to have gone into televangelist mode with a very specific message. Have learned from life experience that most anyone who is super passionate about anything doesn't want to discuss complexities and is largely immune to empirical evidence or pretty much any argument that conflicts with "the message." My reaction if what is described in the article is accurate would be to do my own research from medical sites or one like the cite.
Even without this guy doing anything think there is already enough in the mainstream media (real news sources) that parents are doing the research. Am guessing that has a lot to do with the drop in youth participating in contact sports which will ripple up the line as time goes on. Also am guessing DoD is pouring money into research on how better to protect military personnel.