My name is Bill, I have been into effective altruism for a few years, dipping in and out of the community.
I work as a policy researcher for a think tank, where my work focuses on UK innovation, productivity and transportation. My educational background is a mix of philosophy, mathematics and data science.
I am a little confused about the purpose of this post, because surely meta-EA is just EA? I feel like the major innovation of EA is the idea that altruists can and should compare the value of different interventions (which you appear to consider meta-EA). In other words, EA is meta-altruism.
The content might be useful as a road-map, but I think that the terminology is a bit misleading. What these areas have in common is that they are indirect, as opposed to having some kind of abstract meta-ness property.