One of the possible reason maybe they are having a technical problem these few days, and I suspected that because on this topic that they are facing now. It is bad for their reputation to help scammer on Binance tumbled on chipmixer. I don't if $200 worth of bitcoin will enough for them to exit scam that Op accusing(probably not).
Anyway OP, are you sure that you are in the right link of chipmixer? or you are fall in a phishing site?