To be honest I don't have a case to make, I just found it a bit glaring that you mentioned it was "easy to fix" but then referenced an article which didn't really provide any clear evidence for that. I'm entirely open to the idea of IR35 (though to be honest I haven't considered it closely), and I can easily believe there are lots of hit pieces, but if it is as easily effective as you claim then there should be academic articles providing evidence even despite the confounding factors.