I'm highly skeptical of these claims, the Anglos have an obnoxious tendency of making very loud, pre-emptive accusations of treason, foreign interference and espionage, usually to their own citizens of Chinese descent or the thin air. And then most of these accusation fade into obscurity because there's isn't any actual evidence. Obviously, everyone remembers the loud obnoxious accusation but not the fact that most of them don't amount to anything.
The CIA/Feds was accusing a bunch of American Chinese researchers for espionage, but most couldn't get any charge to stick, they even publicly admitted it's a public display to intimidate people to not even dare think of such a thing.