I have read that and been linked that multiple times.
I responded to it here: https://finecity.social/notes/9gcoisoofl
tl;dr: Facebook and Google didn't "destroy" XMPP. XMPP was used by basically nobody before Facebook and Google picked it up, and after they dropped it again XMPP is still used by basically nobody. Its spec also doesn't include support for features that consumers expect to have in messaging software, which is part of why nobody uses it.