I Wouldn’t write the above official statement, if there wasn’t another way.
The unofficial way
using the Web Api
Like you can see the IP Addresses and configuration there on Homey Developer Tools
You can also use the Web API Playground to enable or disable WiFi without using a paperclip / SIM-Ejector pin.
Homey.system.getInfo(); // Get the info and Check it is working on Ethernet
Homey.system.disableWifi(); // Disable the WiFi i
Homey.system.enableWifi();