I'm not sure how to respond to it being 50% new age pseudoscience, because I'm having trouble even putting my finger on that as a criticism. Are there more specific criticisms? A lot of systems thinking comes down to basic rationalism and causality, doing things like checking assumptions and conclusions through critical thinking. Maybe that part of it isn't rooted in empiricism, but that's not a bad thing at all. The rationalism vs empiricism debate goes back centuries.