Yes, it looks like a WGS-84 survey vs traditional survey error. The airport is surveyed by one method - probably traditional; and the VOR position is probably listed in a GPS compliant WGS-84 method.
The easiest solution is to move the visible VOR antenna scenery object. You cannot move actual VOR locations in FSX.
The correct solution would be to move everything else on the airport 540 feet north - which would require a lot of work - especially since you would likely have to remove the old coastline and build a new one.
@ PawPaw's house - near KADS, Addison, Texas, USA