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Yeah, we can't have people doing this kind of thing, so I've banned the account, at least until we have some reason to believe it won't happen again.

could be the same person?

Doesn't look like it

Or someone who read the tweet, liked it, and wanted to share on a forum where they more actively participate.

Probably not a bot. Just reposting content from twitter over here.

It's quite entertaining though that this particular conspiracy theory is catnip to HN users. Perhaps it's for the same reason it's blowing up on twitter: vague enough to capture the imaginations of people who might be imagining wildly different concrete scenarios?