I think Sasha has already contacted him.
GNH shareholders could always bombard him with requests, but I would suspect that Brent Cook is not much different than any other 'promoter' in terms of that he probably charges fees to visit a company in order to cover them.
It would certainly make sense for him to look at GNH more closely if he is going to make public comments about it.
As Glorieux posted, I'm sure a paragraph or two from the 43-101 report signed off by McMillan is all he needs to see that he wrong when he called it a shear hosted system.