I should have talked with Tim
I should have talked with Tim about this directly -- but I believe that it's simply to make the QC port more valuable and thereby make the LEAF more valuable than e.g. the Ford Focus Electric which doesn't have QC at all. Nissan didn't want to do this but felt they had to due to the lack of CHADEMO deployments.
In France, Renault is also building a network of fast charging stations to support the ZOE rollout.