I doubt there are that many Boomers left in tech management - almost all that age cohort are in retirement or semi-retired, they're enjoying their Saga cruises and golf courses (or if they're unlucky, their Walmart greeter jobs).

I suspect there are managers panicking about losing relevance in a post-office world, but those will be middle-managers, not CEOs. Much of the panic is from owners of commercial real estate and their flying monkeys in the media who are seeing empty office blocks and declining property values and rents.

As for Musk, who knows. He's in his own very weird bubble of long-terminism or cosmism or whatever it is he believes in. Maybe he thinks if everyone works from home it will lead to a drop in birth rates or decline in Western society or something.