Factually incorrect.There are expat TREs
Who? The last expat TRI on the 330 was a Swede and they made his life a living hell, pumped up charges against him until he left.
The locals do not like expats there for one, and the management types do not like expats as instructors. The instructor positions are held for locals and given out as "attaboys" for those who kiss up to management. No teaching skills needed or required. There are a few of the old timers who instruct (RG, JL, BJ) who are actually good instructors, but the others leave a lot to be desired.