In my head, I imagine Zuck would prefer to just force all the employees into one large room and dump as many knives as there are jobs he wants to keep in and let nature take its course, but I could be a bit of a cynic.
I think there's a legitimate issue with how salary expectations have increased during the pandemic. These expectations will now have to be corrected. What's happening at Facebook is just part of that correction.
Google is doing the same thing, as are other tech companies.