I think some exchanges have notified CZ already that they will block those addresses, but I don't know if he has discussed this to some known mixers to block it as well.
If you look at the outputs, two of them went to 3BMEX addresses, which I find very strange if these turn out to be actual BitMEX addresses. My first thought is that it is an utter stupid move from the hackers.
My second thought, considering that it only concerns a small amount, is that the hackers are testing how an exchange as BitMEX reacts. More like will the funds be blocked immediately or can they freely withdraw them...
As for the mixers, I doubt they will respond to such requests. If they are really valuing people's privacy, regardless of the coin taint, they'll mix it and let the 'clean' coins be withdrawn.