Or you're making out that CTE is a bigger issue in the rugbys and other contact sports to push the point that it'll have a significantly larger impact on them than other sports to win an argument on the internet, when that isn't necessarily the case in reality.
I'd go so far as to say that it shouldn't be the case in reality.
That's exactly my point though; contact and combat sports are only overrepresented because that's where the majority of the research, and media attention, has been so far. However almost every time somebody has looked for CTE in another sport they've found it, or at least something similar to it, and it's only a matter of time before we start to better understand that and it becomes more publicised.
In other words, we're starting to find CTE in what look to be statistically significant rates in dozens of sports, most of which aren't traditionally considered contact sports, and potentially other recreational activities as well.
We've also found that you don't need to be concussed, in either the clinical or colloquial sense, to develop symptoms of CTE. Subconcussive impacts have been shown to cause the brain to move within the skull without causing the symptoms associated with concussions, but are also still capable of causing brain damage associated with CTE if you're exposed to enough over an extended period.
The really crazy thing about subconcussive impacts is that they can be so small that you don't even need to make contact with anything to cause one. The vibrations of moving at high speeds or g-force associated with cornering or suddenly stopping can be enough to cause subconcussive impacts.
So sure, there'll almost certainly be a higher rate of CTE in the combat and contact sports on average (there do seem to be potential exceptions like bobsleigh though), and generally speaking the cases of CTE in combat and contact sports seem to be worse. However the presence of CTE in most other sports still seems to be significant,
and the cases there are still life changing.