If it was just a bunch of linked profiles with a job matching function, it would still be LinkedIn.
But of course, you can't work at a place that does something that mundane without suggesting something that makes you look like Facebook or Twitter. You have to at least give people some sort of reason to see what their old colleagues are up to.
Nobody really wants to read the LinkedIn feed, so it's perfectly acceptable that it gets flooded with AI generated content. In effect, the content on LinkedIn is that picture of a happy family on your insurance brochure. You can't not have a photo of something on that kind of marketing document, and you can't be a social network without some sort of doom-scrollable content.
This is just a cheap way to generate some wallpaper.