I strongly and sincerely ask new overseas teachers to think very carefully before following the advice of this chap.
Again, my advice, should the written contract fail to resolved any problems, is to work on having a good relationship with a college. In this way, youll be asking a friend, not a stranger.
This situation is not ideas, but it is a winning strategy when all else fails. Think of it like this, if contracts can and should be clearly followed, when is this chap so upset so often? It is because he cannot adapt when he is faced with a challenging situation, and so he reverts to shouting and stabbing his contract with his finger. It doesnt work.

'This chappie is not so upset so often.He has realised that it's dumb to get upset.It serves no useful purpose and is bad for his health.He accepts that he's having to deal with unprincipled employers,whom he looks down upon.He doesn't revert to rowdy behavior when contracts are broken.He puts his case forward in a reasonable manner these days.Admittedly,when he first came to China he was appalled and angered by the dishonest behavior of his employers.But he's mellowed since then,and realised that they don't deserve his trust.So long as he has a fair contract that includes the standard arbitration clause,he'll be all right.They will agree with his point of view,as they've no choice but to do so whenever they have breeched the contact,and that has been pointed out to them.He's firm and calm,and approaches the discussion re the breech just like a lawyer would.He won't be cheated,but without the arbitration clause in place as a last resort,he might well be!That chappie has a different point of view from him(this chappie).So be it.