I agree with the general argument. I think (some) philosophy is an immature science, or predecessor to a science, and some is in reference to how to do things better, therefore subject to less stringent, but not fundamentally different, standards than science--political philosophy, say (assuming, counterfactually, political thinking were remotely rational). And of course a lot of philosophy is just nonsense--probably most of it. But economics can hardly be called a science. If anything, the "field" has experienced retrograde evolution since it stopped being part of philosophy.