For anyone stumbling upon this thread in 2025, this still works.
I’m have a Snapmaker 2.0 A350 with firmware version Snapmaker2_V1.20.3_20240716.
Plugged in a Microsoft USB to Ethernet adapter from an old Surface, and it worked immediately with no configuration. I disabled Wi-Fi on the controller. You have to manually type the IP into Luban to connect. You’ll then be asked to confirm on the controller to allow the “wi-fi” connection. The good thing is that Luban will remember the last IP you typed into the “manually connect” box, so if you set a DHCP reservation for your printer, you can basically just click through when connecting.