Gold was the best form of money they had with the smallest inflation. And thats their pick.
They needed to stay within their reality and possibilities.
As I said in our current reality we have Bitcoin which much better than gold.
Discussion
maybe somewhere one of those gys suggested that the inflation rate of gold was actually too high?
but I've never seen anything like that.
and obviously, you don't speak for them and have no idea if they would agree with you or not.
I'll also point out
while the Austrian School of course criticized economic grown via inflation,
nowhere did any of them argue that constant, permanent deflation was the best possible environment either.