Err, some of those are tied to stock exchange crashes, others to extended warfare periods etc. And all are tied with ever-expanding industrial production, which is another independent parameter.
When did the actual observation that gold economies are not more stable happen?
The list provided only shows that they also have crises -- it doesn't show how those crises measure (respective to fiat currency economies) in magnitude, frequency and consequences.
Well, go on and make your point then. They seemed pretty frequent, consequential, and high-magnitude to me, certainly comparable to the 20th and 21st centuries (and even the Great Depression began under the gold standard).