It's "NMR" in the sense that the nonce is long enough to safely use random nonces, you mean? In practice, Kubernetes can use random GCM nonces safely too. Real NMR ciphers don't just have misuse-resistant ergonomics, but also better failure modes when the ergonomics fail: if you reuse a Chapoly nonce, it blows up. That doesn't happen with AEZ or SIV.