Yes, and?

It's well established that the effects of repeated head trauma are cumulative, with progressively longer healing periods, worse symptoms, etc. And that sub-concussive impacts also accumulate along with the concussive impacts.

From the article: The bulk of the head impacts that these former NFL players experienced didn’t occur at the NFL level. They occurred at the collegiate level ... and at the high school level and in many cases the youth level. And all of those cumulative hits to the head added up to result in an increased risk,” said Daneshvar.