Wat mean in plain engrish?

Direct peer to peer connection between your device and another device.

Meaning you can set up a jump server that is exposed on a domain using Holesail, and without the issues that stem from NWS.

The founder of Holesail, @supersu, has a more detailed critique.

supersu

Unpopular opinion: Absolutely terrible idea

Nostr-web-services is just ngrok / cloudflared with extra steps and more concerns about safety...

This should explain it

Still confused How would I explain to my mom ?

Instead of using central servers to expose your self-hosted stuff, you can use Holesail to do the same, and it all connects peer to peer; there is no third party in between. + There is no public URL like a domain, so hackers can not find you. Only the person you choose to share the connection with can find you and connect to you.