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You should not be using NAT to access your Plex externally, I will explain.
App.plex.tv and the apps use Plex services to generate a point to point connection from remote clients through your router to the server. This is important because you never need to expose a private IP to the Internet, and the authentication can be protected with something robust like a Google account which support 2FA and even phishing-resistant 2FA.
The combination of more advanced security and secure/convenient SSO authentication are one of the biggest benefits of Plex in my opinion.
If you enable the "remote access" in Plex you are essentially port forwarding you server to the internet using UPnP (by default. You can also port forward manually if you'd like).
It's indeed a point to point connection but a point to point connection the same way your connection to normal websites are point to point.
If you knew the public IP of anyone that's using Plex you can likely go to [IP]:[Random PORT] and access their server. You still need to login though.
Source: My own tests and https://support.plex.tv/articles/200931138-troubleshooting-remote-access/