Tl;dr: They use proper workflows for building the OS.

No Idea why they advertise this on their end-customer facing sites.

Source: https://universal-blue.org/

we’re doing better than basically every other 1st world country

You must have a very unusual definition of first world.

There are many, many more spoiled rich kids not nearly as successful as Musk. Musk certainly is exceptionally good at managing businesses. Let’s see how good he is at (directly) influencing a government.

900 troops doesn’t seem like a lot. Does that amount really make a difference?

Don’t live in the USA, simple as.