Not calling Assange a journalist does a great deal of unwarranted justice to the plenty clickbait bloggers, who also happen to be labelled as journalists.
You can be a shit journalist and still be a journalist. If I push a csv to a GitHub repo does that make me a journalists? I think this is the semantics posters are trying to highlight.
A publisher, maybe. But I'm squarely in the 'not a journalist' camp.