That's a completely unsupported assertion. Why would the CPython devs punish one of the largest and well known python projects by moving to a non-python DVCS?

That's a completely unsupported assertion. Why would the CPython devs punish one of the largest and well known python projects by moving to a non-python DVCS? That would create an absolutely toxic effect in the python community. They didn't move from mercurial because of python any more than they moved to Git because they like C.