The Pole's English is not good enough for him to be an effective foreign teacher of English anywhere on the planet. There's no doubt about that.
But the issue here is whether Linyi Normal University is a good employer or not. Let's focus on why Linyi Normal University should be avoided by all foreign teachers. From a prospective foreign teacher's point of view, the problem with Linyi Normal University is that they sign a teaching contract with an FT, and then do not obey its terms and conditions. The Pole gives several examples of that university cheating him and his wife in this way. You can read for yourself by clicking on the URL below.

http://www.kozok.eu/en/chinypraca.php