This does not appear to be the case as when you look at the map on the Tesla web site all of the sites are right on the city name as it appears on the map, which appears to be using Google Maps. Therefore they appear to be placeholders for the town/city rather than an exact, permitted location. This is the case for Pickering, Markham, Vaughan, Concord, Toronto, Mississauga, Meadowvale, etc.
One possible exception is Hamilton which isn't exactly on the city name, it shows at Ray St just south of Canada St. But I am not sure about that as this doesn't look like a great location on a dead end street.