I am not sure this is how that works.
Were China to choose to depreciate their currency (especially at a faster rate than they are currently) this could lead to an acceleration in attempts to export capital.
It's not clear which way this linkage works (at least to me)
If the Yuan weakens to USD, the Chinese have less buying power in the U.S. for laundering, and existing launderers will be incentivized to pull out (sell).