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Then you haven't read enough jepsen reports. Distributed system guarantees generally can't be trusted

Postgres is not a distributed system in this configuration usually though is it?

The result is for “Amazon RDS for PostgreSQL multi-AZ clusters” which are certainly a distributed system.

I’m not well versed in RDS but I believe that clustered is the only way to use it.

No, you can have single instances

This writeup tested multi-AZ RDS for Postgres — which is always distributed behind the scenes (otherwise, it couldn't exist in multiple AZs).

An RDS cluster can have a single instance (but it can't be multi-AZ with a single instance.)

A multi-AZ cluster is necessarily a distributed system.