Right – what “support” has anyone given the person doing the riding? If it’s merely being in a van somewhere in the highlands incase everything goes horribly wrong then it can be considered support in any meaningful sense. For many stretches of the WHW there is no road access and no mobile phone signal and the bits where there is both are so bloody easy to ride that nobody will ever have a problem on them.
If the guy in the van are preparing meals, fixing and swapping out bikes, towing the guy along – then it’s a supported ride. Anything else is just nonsense.
Did the stupid interpretation of unsupported come from across the pond per chance? If so that might explain the pure knuckleheadedness of it.