I would refrain from painting Deimorz as intentionally misleading

I don't think that's what happened here; in the same way that you saw Deimorz's comment as not malicious, I didn't see the response mentioning their connection to the issue as malicious either. You mention that the "disclosure was done sometime in the past", but I had never heard of them or the site they founded, so I found the comment replying with context to be informative.