At $54.2 billion, it's even newsworthy just through the sheer size of the transaction. I'm not sure, but might it be the highest valued company to ever go from public to private?
As for why it's on second page right now - I think it was submitted after this one https://news.ycombinator.com/item?id=33082482 , and some people flagged it as duplicate (and this has silent effect on ranking).
Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.
I think people are burned out on Musk and Twitter, and waiting for him to announce that he's buying Cloudflare.