I would be surprised if it were (a clean split between academics and teachers). However, it seems like your link at least isn't at odds with the idea that there

I would be surprised if it were (a clean split between academics and teachers). However, it seems like your link at least isn't at odds with the idea that there may be a clean split between those who seek to optimise for the declared learning outcome (reading proficiency, in this case) and those who optimise for the advancement of some political goal to which the learning outcome is at best conditionally conducive, and almost certainly secondary. (Just look at the tag collection in the sidebar.)