I see that he says "We know from examples in India and elsewhere in Asia that single stones this size can even be carried on wooden lattices by groups of 60 – they didn’t even have to drag them if they didn’t want to.” https://mikepitts.wordpress.com/2015/12/07/have-archaeologists-found-stonehenge-quarries/

If and when the truth of that is accepted it changes the whole tone of the debate. It has been claimed that Occam's razor makes glaciers most likely but if you can just pick them up and walk for 3 weeks, well ....