"bluetooth 2 and 3", it meant the Class 2 and 3, not version of the Bluetooth protocol.
With that said, it means the "range" is the key here.
Class 3 less than 10 meters
Class 2 10 meters, 33 feet
The version 4 that you mention is reported to reach up to 50 meters, so it is not allowed. But then, the Soccer TC will be the best one to verify this, of course.