Yup! This is the stock market. No apologies needed for buying or selling. The only thing that would be wrong would be if he was saying "BUY, BUY, BUY" when selling or dumping on the company while buying. I really don't care for that sort of thing. But buying and selling is what it is all about.
This stock benefits from flippers as well as long-term holders IMHO. I happen to think the long-term holders are going to be the ones who do the best, and I haven't sold a single share -- and might have bought some of his. But a profit is a profit, and we benefit from high volume!