Actually he didn't sayed that he could cure aids, but that he knew how to heal himself from aids if he happens to get it (which is still a little strange).
However, this is not the subject here. Being wrong/foolish at one time doesn't mean being wrong/foolish all the time. And there is no need to value Bhante Vimalaramsi's credibility here, since he is only talking about things we can easily verify.
So if you disagree whith what he says in this video (which I assume you do), please offer us some counter arguments. Please consider the words, not the speaker, and explain why you disagree whith him. I would be interested in your answer if you had the time and motivation to do it. And I'm not saying this in a challenging way, I would be truely interested in what you have to say