"economists"

Mitchell-innes says in his 1914 "credit theory" essay that our money would appreciate if we were to de-peg it from gold:

"We imagine that, by maintaining gold at a fixed price, we are keeping up the value of our monetary unit, while, in fact, we are doing just the contrary.the longer we maintain gold at its present price, while the metal continues to be plentiful as it is now, the more we depreciate our money"

Would be correct to call Keynesian "economists" charlatans? Quacks? Snake oil salesman? Delusional? Something equivalent to a flat earther?

They definitely are up there(or down?) in the Dunning-Kruger effect graph regarding how markets and economy works.