We all know how these training centre or agent clowns in China operate - after they succeeded to get you in the door, your "pretty good salary" will turn out to be a crap salary in fact.
Am I right?

All the more reason to check with other FT's, Turnoi; they(the schools) tend to behave in the same tricky way time and time again, if they do behave like that. If they will not cooperate with you obtaining references for them from other FT's, simply give that school a miss. I blame FT's not doing proper checks for this lying by omission as a matter of course; it has become habitual.