This is mostly snake oil, perhaps efficient against the dumbest of criminals. The newer generation coin laundry service, for example Chipmixer, will have pre-fu

This is mostly snake oil, perhaps efficient against the dumbest of criminals. The newer generation coin laundry service, for example Chipmixer, will have pre-funded addresses already waiting in the blockchain before the "client" even makes an account. In exchange for a deposit in a wallet controlled by Chipmixer, the client will receive a set of corresponding private keys that add up to the total value being laundered. You might trace that the coins went into a laundry, but you will never associate with the previously laundered coins that the client got.