No, it really doesn't. For it to have been a lawsuit-worthy slander, it couldn't have been an implication, which is what Dick did, but rather a direct accusation.
If you read what he said, he never directly accused Buchholz of "cheating". All Hayhurst said publicly was that Buchh loaded his arm with something, and said "wow" through twitter.
You can't (well you can, but you shouldn't because it won't prosper) base a lawsuit off an implication, and even then, where is the provable damage done to Buchholz' reputation that would impede him from performing the activities that ensure his livelihood?
It's not that simple.