This isn't anything new. There have been people who had HIV even early in the discovery of the disease who for unknown reasons had no symptoms and very low viral loads. There was a group in San Francisco, I believe, that was studied at that time and followed over time. I don't know what happened to that, probably nothing since we haven't heard much about it since. But just avoid getting it, as mentioned above, because if it isn't everyone, it won't be you, most likely. Stay safe.
Since this is an HIV prevention forum, let us be clear that the best way to avoid HIV is to eliminate risk factors, by not having unprotected intercourse with someone of unknown HIV status, and by not sharing intravenous needles. The vast majority of HIV infections are preventable through these practices.
He is not considered cured at this point. He is considered to be in long-term remission. There is nothing really to think about a single case, except that it opens up some additional avenues for researchers to investigate.