I answered that one a few posts up.
I am having a hard time following the thread, but I'lll try. You mean the iPhone has a data connection, say to a Cell carrier, and you want to hook the iPhone up to the computer via Ethernet to share the data connection? I haven't tried this specifically so it may not work if Apple doesn't...
forums.macrumors.com
I returned my iPP 2020 for the 2021 model so I can't test it until the new one arrives (though you don't get ThunderBolt support until the 2021 iPP so there's that too). But I expect it will work the same way it works for the iPhone and other devices. You'd need to hook it up to the computer via USB where it creates a virtual "USB Ethernet" adapter on the computer to allow "Personal Hotspot" to provide support (you can technically do this via WiFi personal hotspot too on Windows). You could then "bridge" that connection on a computer to its ethernet adapter to connect multiple computers if you needed to.
When there aren't ports available on the router and Wi-Fi connectivity isn't possible, then use Network Bridge on Windows 10 to join other PCs to the network.
www.windowscentral.com
Use Network settings on your Mac to set up a virtual network bridge.
support.apple.com
Third Party tools might allow it with less steps, but Apple won't automatically bridge the connections as that would cause network topology issues for normal use cases.
iPadOS doesn't allow creating network bridges so you can't do it without a computer in the middle (but that's fine since you're trying to do this do computers anyway).