These aren’t Asian tech workers, they are the temporary workers that stuff Trump’s clubs and pick the grapes in the Trump family vineyard during peak season.
And yes, if they paid enough they’d have plenty of Americans to do the work. Even if college kids who could work their studies around the schedule. (Much of it is summer or fall labor.)
I’m old enough to remember when US citizen high school students or recent graduates would spend a summer working at east coast beach resorts.
Now it’s mostly irish or east europeans - some on legitimate work visas (h2b?) some just working here illegally (on tourist visas but violating the work terms.)