I agree that 'everything is public health,' and everything is more or less fair game. However I think this does need to differ from wikipedia in that we do relate things to public health in some way, and we provide resources for people who are doing research on the topics. Additionally, I'd like to consciously use public health terminology in critiquing the same issues (i.e. social determinants of health — why is this problematic? food deserts - why is this problematic? What is a "low hanging fruit" in public health) and so on. I think based on our education at SPH we've been given a toolkit, essentially, and we can expand on that in a radical tradition (and bring in other folks, of course, from other disciplines.) Overall I like how it's looking so far.
Even if not everything is super useful, I think there's a lot of area to apply critical theory to public health. Even if we're just talking about post-structuralism or neoliberalism or whatever, it's important to provide that context to public health practitioners since I know we didn't hear about any of that stuff in class. And as we know, language (words or the absence of words) is important in shaping ideology, and I know we hope to shape ideology at SPH and elsewhere.