Unironically, this is one of the simpler setups for a multi-node WP setup I have seen, and I have set up prod WP many times. Anyone with associate level knowledge of AWS can do this. There is a reason there are entire companies (pantheon) dedicated to hosting Wordpress for you: doing it with speed, resiliency and redundancy is hard.
I would have posted internal slides directly from app architects or even service(-prototyping) dev teams within AWS including similar vibes regarding this discussion, but for obvious reasons that's not a good idea. But whom am I telling that ... That "reference architecture" aimed at customers using their infrastructure regarding a Wordpress installation gets the general idea across, though.
