See the post on BlueSky: https://bsky.app/profile/provisionalidea.bsky.social/post/3lhujtm2qkc2i
According to many comments, the US government DOES use SQL, and Musk is not understanding much what's going on.
IIRC they kicked him out of PayPal because he wanted to run everything on windows instead of the Unix/Linux servers they were running on. And the reason for it was because he couldn't figure out Linux.