Source for thinking the degrowth crowd thinks this: Introduction to “The Future is Degrowth”. Does the degrowth crowd really think they can get rid of capitalism without any violence? This seems to have the opposite of a historical precedent, and is a deviation in Marxism, which they seem to heavily draw from. Anytime revolutionaries took the peaceful road they got outcompeted at best and massacred at worst.
I support degrowth, but only after the revolution. Any degrowth within capitalism is just going to be austerity.
I don’t think degrowth is the answer, but it depends on your definition of degrowth. Growth using green technology and renewable energy backed by socialist economic planning should be the solution.