As a local who parks in that garage a lot, there shouldn't be too much of a problem with ICEing of the spots, unless someone is really trying to be malicious. That garage doesn't get heavy use - theater-goers park elsewhere, and Wegmans is at the other end of the shopping center. Especially not on the back side of any of the upper decks - when I'm there (mid-day, mostly Fridays), I almost always park right on the first floor ramp going up. And there are separate garage areas for residents.
This location will be a big draw for Villages, taking some business away from Landsdowne Town Center (no chargers I'm aware of) and One Loudoun (7 free Volta chargers - almost always full). I'm thrilled to see this getting completed.