Supply Question

[Compass Rose]

In the attached pic from the game Tobruk, the British player advanced his recon units to the far west (left) of the game map and held the main road hexs at the end of the game map. One of the game settings we were using was virtual truck supply. Needless to say, because of this action, my troops have been in Isolated status for several turns.

My supply question is if we were playing with explicit supply instead of virtual truck supply, would all of the German units still be in isolated status if the Brits did the same type of move?

Thanks