So, they accept that inflation is bad, because inflation is a signal that resources are nowhere near maxed out, and basing an economic system on having inflation means said system expect infinite growth, in a finite set of resources, correct?

Jesus Christ. That’s not what inflation is.

So, basically, economics are just a bunch of untested ruminations of academia then, and have no place in our decision making, correct?

Economics is predicated on the study and prediction of economic trends. I don’t know how you got “Economics is untested” from “Economists have no control over economic policy”, even after a very clear and pertinent comparison with climate scientists.