I've experienced a multitude of situations where fringe proponents demand that granite cannot be cut with copper and sand.
Stocks proves that is wrong.
I haven't see where Stocks explicitly states that "this is how they did it."
From what I've read, he's just trying to see if his hypothesis concerning slabbing and tube saws is possible. Whether such a method can work, that is.
He's shown that it can. I don't see how there's any doubt about that.
Therefore, given the multitude of observed saw marks on granite, limestone, basalt, etc., until someone comes up with an entirely different method - and demonstrates it will work - I can't see how anyone can dismiss Stock's hypothesis logically.