This is not a new thing. A decade ago, when I was more active in OSS, I remember occasionally seeing bizarre posts on our mailing lists that had a distinctly Markovian feel that included hallucinated snippets of code. In some cases they used completely unnecessary and out-of-character (for our lists) profanity. These posts were often plausible enough that they usually netted a legitimate reply or two before someone pointed out the OP was a bot.

The goal in some way or another seemed to be spam, either getting access to email addresses, or access to some venue (I guess an issue tracker?) where spam could be posted.