Basically, a lot of these sites allow you to "opt out" of reporting as well as manually update living status. A shitty news article is all it would take to report him as dead and seeing as how Byuu is tech savvy, it would take no effort to report himself as dead.Does that work with other sites like Intelius? It doesn't (incorrectly) list him as deceased.
Sites that require official documents will not update a death listing. No obituary or death certificate, no update on death.