This is how networks work:
Basically, you can set up a proxy for multiple servers to be connected together, a network. But that proxy server isnt actually a server. Meaning theres no world there to connect on. Lemme show an example
Lets call the top one "Server 1" and the bottom one "Server 2". people can join using the ip "Server 1.minehut.gg" or "/join Server 1", but they will connect to Server 2.