For those who (like me) have never heard of this distro:
aerynOS (“erinOS”) is an independent Linux distribution being built from the ground up with its own tooling. We are developing an atomic operating system which supports both declarative and imperative system management approaches, and offers rollback capabilities that help reduce the risk of system failure from unsuccessful or interrupted updates.
and here's part of their blurb about moss:
moss looks and feels a lot like a regular package manager, however it actually manages the entire operating system via content addressable storage. Every single file from every package is deduplicated via a hash-based addressing scheme in the moss store, allowing us to produce new system roots on the fly.