That was what I was referring to. They sent an update and wrote a blog post when it happened: https://keybase.io/blog/keybase-joins-zoom

"Ultimately Keybase's future is in Zoom's hands, and we'll see where that takes us. Of course, if anything changes about Keybase’s availability, our users will get plenty of notice."

No update since. Keybase still works (and I use it constantly), but will it be around in two years?