I mean, you are going to see an exodus of tech workers regardless as US economy withers up and other countries (probably in EU) pick up the slack.
China won't even have to have high salaries, all they would need to do is basically set up immigrant neighborhoods that have all the familiar things that US people like, and through the nature of just being around people of similar status, whatever the salary everyone gets paid gets normalized - there isn't anything you would be able to buy to "flex" on your peers, and everyone would be in the same boat.
China isn't interested in immigration. In a relatively liberal and democratic country like the US, immigration is a boon because we don't care all that much about political or economic stability and are used to not having it. In an authoritarian oligarchy like China it's poison because an unstable environment will see the government in trouble quickly when people lose confidence in the party and leadership.
But if China starts importing immigrants, it will be just another shithole. Their quality and success come from their own population. Importing foreigners is just poisoning yourself your culture and future.
China won't even have to have high salaries, all they would need to do is basically set up immigrant neighborhoods that have all the familiar things that US people like, and through the nature of just being around people of similar status, whatever the salary everyone gets paid gets normalized - there isn't anything you would be able to buy to "flex" on your peers, and everyone would be in the same boat.