As per the title, apparently PMDG updates have made the update of navdata in their aircraft via Navigraph Hub obsolete, and further to that, using Navigraph Hub to update their navdata will cause issues. Please see the following thread in the PMDG forums.
As per the last post from Mathijs, PMDG have handed the ball back to Navigraph.
They want to use their EFBs to update the navdata, and having the option to update the PMDG navdata in Navigraph Hub is causing confusion, and is causing errors if someone attempts to update via the EFB after updating via Navigraph Hub. This is occurring in all the 737s and the 777s.