Actually the way I read it, they cant collect a deposit or take money from your paycheck, but they are within their rights to ask for breach of contract money.
From the website you quoted it says
"If the school takes part of your wages or tries to collect a deposit against you..." and
"Any dwan chee bushiban that makes deductions against earned wages when you quit your job or tries to collect any deposit for quitting is in obvious violation of the act"
They are not taking a part of your wages or collecting a deposit, they are asking for the money that was agreed in the contract for breaking the contract. There is no deduction against your wages and they never asked for a deposit when you signed up, this is a contract cancellation penalty which they are allowed to ask for.
Will they pursue it? From what Ive heard, likely not, since it is a lot of trouble for little reward, but they certainly can try legally. I wouldn't lose sleep over it.