You're assuming a lot about Elon's ability to assemble and execute a process competently. They will probably end up hiring people off this list and firing them later.
I think what is much more interesting is what OpenAI and Google will do. There's probably some threshold of signatories where the companies in question do not fire everyone when they decide they want the DoD's business, the question will be how many people have to sign to cross it... and will enough people sign.
I don't think Google would bat an eye at firing 500 people to secure a DoD contract, but would they fire 5,000?
Both the automated verification methods depend on Google servers and Google can almost certainly retrieve that data if they want to regardless of if the signers or verifiers delete it.
It's hard to deny an offer to become a millionaire in the next 3 years if you just hang tight at xAI, especially if you don't have any offers from competing AI labs. Also, LLMs are converging into an easy-to-replicate commodity. It doesn't matter much who wastes their money on you to build them.
I am sure some people can. I got pretty far in the interview process at xAI, but couldn't get anyone at other AI labs to even reply my emails, though...
(I dropped out at the end because there were issues with HR not wanting to hire in certain geos, and me not wanting to relocate to the USA or London)