User blog comment:Thiagom12/Hisoka One-shot is canon?/@comment-28556051-20160610040638

It seems like Togashi has read it and not opposed it (yet). Not that that means permission but it's not like we have anything else to go on at the moment. So tentatively canon...-ish. Everything more or less fit into what we know of Hisoka, but also didn't seem to add much to his character. Like Ishida was scared to add anything too bold. The most risqué thing Ishida did was the taste of the water when determining nen type.