There is something wrong with him. His mother however isn't coming off very well here. And it could be any number of reasons.
Just like it was too soon to jump to conclusions about Tre a few weeks ago, its too soon to make any sweeping conclusions about the situation. And the article is poorly written, so its not like its any kind of in-depth reporting.
Mason played the game recklessly IMO. If he did get concussions, who is to say he reported them? Few if any, possibly including Tre, know what's going on. It is a bad situation no matter what's going on.