That's the "legitimate use" I mentioned, but I don't know I have ever actually seen it used that way in practice. It's so easy for debatebros to misuse it to win an argument and that useage has far eclipsed the meaning you mentioned. I'm used to dismissing any and all claims of "sealioning" so saying something like "they're refusing to disengage," or, "they're following me around the site" are much better because they're not wrapped up in an ambiguous and frequently misused term. At this point, I think the "legitimate use" meaning basically only exists to justify the term.

Search "sealioning" on Hexbear and you can find plenty of accusations towards people who are not engaging in what you described. The problem is that the sea lion does multiple things in the comic, calling out an insult (good), asking for evidence (fine), and following them around (bad), and so if the only actually bad thing is following them around, then just say that instead of the more ambiguous term - the only reason to use the more ambiguous term is to characterize someone doing the first two as doing the third, even if they're not.

I'll also point out that I was given a definition previously in this thread that made zero mention of following people around.