Your suspicion of people mentioning rocket scientists in a Space X post raises some suspicions.

To be fair among people with appropriate qualification, there are many more americans who think USA is an "evil capitalistic empire" than immigrants who would support in any way the country they have escaped from.

Also Soviets got lot's of technologies from communist sympathizers in US, but in the end that did not help them much.

So letting SpaceX to handle its trade secrets the way it wants, and hire whomever it wants, is the best way to go.