The Lightning port supported this to via a Lightning>USB-A adapter and then plugging in a USB to Ethernet adapter. I tried this as far back as my iPad Air 2 several years ago, this isn’t a new feature at all.
That makes sense. More power to the people who want to tether their phones to an Ethernet port, I suppose that would be nice if you’re downloading a large game or something just to speed it up a little bit.
iPhone 15 Models Support USB-C to Ethernet for Faster Internet Speeds (www.macrumors.com)