I believe Elon was saying 90 percent of government employees are not showing up at offices weekly now. Is it possible, that many of these employees do not even exist, and their paycheck is all just going to enrich a handful of insiders?
Thus, demanding that everyone shows up to work would be a means of calling them out on their fraud.
I was thinking this same thing when Elon fired all of the Twitter staff and the company still functioned. They work from home because they don't exist and they are laundering the money.