I saw this a while ago and I believe the consensus was that these users are using some borked client to post to Lemmy that does not understand you can create a text post with no associated link or image. I.e. badly behaved apps make the link/image field mandatory (like how reddit works) when this is not actually the case. So they have to put something in that box to make the app happy and allow them to post.
But both the title and the link are nonsense (and the post body is empty). If the posts were only half-nonsense I probably would've guessed the explanation you just gave and not bothered to ask about it.
If the content is nonsense too then yeah, I have no idea.
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