the concept of chipmixer has the flaw you have to trust an private key which is known by the mixer. "not your your keys - not your bitcoins" or in this case "private keys that are known to an other party are worthless because you have to trust the other party"

and the flaw will not become less a flaw if the mixer is paying one of the highest in a signature campaign. (by the way I doubt you will stop promoting it if something happened with chipmixer. we had the case in the past)