Speaking as a long-time IT guy, I have to think that it’s mostly hot air, and there’s nothing useful that can actually be done with any of it. If it’s not, it’s staggeringly blinkered and incompetent.
First, in order to actually do something useful, he (Musk) would need a complete list of Federal employees and their email addresses. By complete, I mean everyone in each system at each agency. I sort of doubt the Federal IT infrastructure is so centralized that it’s all in one place, so you’ve more than likely got at best, departmental email systems. And in some cases I’ll bet it’s more decentralized than that.
So that takes time to gather all those lists, combine them, see who’s missing, etc… I’d guess on the order of weeks, if not months to gather and collate.
Then once you’ve got that list, it’s relatively trivial to set something up to receive those emails, log the addresses they come from, and check them against the list. That’s minutes at best to produce that list, and maybe a half-hour to make it look pretty. But then what do you do?
Presumably the idea is to see who doesn’t reply, and follow up. But the catch is that I’d also bet that there are a fair number of discontinued accounts and the like that should be removed, but who don’t represent dead weight on the Federal government. More importantly, there are also likely thousands of Federal employees who just don’t read email regularly as part of their jobs, because their jobs are remote, outside, or just not the sort that involve emails. People like say… undercover FBI people, Coast Guard/Navy ship crews, and so on. This Keystone Kops digital dragnet would catch these people, even though they’re not dead weight either.
If the idea is something hare-brained like using AI to parse the bullets for validity, then you’d also have to have some sort of corresponding HR job description for each of those people and some way to actually determine if what they did was valid. That’s the sort of project that takes years to design and engineer; if only because I’m guessing a majority of jobs’ descriptions don’t really correspond to what someone actually does, just like everywhere else in the world.