I mean it's possible but I feel like Yesavage might have given a bit more context if that were so. Whereas with gambling they can't say anything negative when they are such a big sponsor. Also, other players and their families have faced this kind of harassment over gambling losses.
Also possible that it's some of both. Yesavage was trash talking Boston a bit if I recall. But if I had to bet on it, mostly gambling (pun intended)