Not even a passing mention of the privacy questions at stake here. I don’t fault the police for seeking answers, but every self-nominated amateur sleuth isn’t due an answer about the identity of someone who in all likelihood wanted to live privately and never committed a crime.
On his hike he was anonymous as far as his real name goes, but he shared some things with people, and I'm not convinced we know that we know what his wishes were as far as his death goes, if any family would ever hear of it, etc.
That could give some peace to their beloved ones, and nothing can harm him anymore. It seems that he has tell to be a divorced; maybe he has children. I think that is a fair move.
Is there no an index of "unrecognized dead people" that can be matched to a list of "people seeking to find disappeared lost one"? I would imagine if a loved one asks for them, providing pictures, the authorities could the said matching?