Review on 🔌 Cable Matters USB C to Gigabit Ethernet Adapter with 100W Charging - High-Speed Wired Ethernet (480Mbps) for Chromecast with Google TV (2020 Version), Laptops, and More by Paul Bijeaux

It's unclear that Cable Matters is listing this adapter as Ethernet up to 480Mbps. That's certainly true if you plug it into a USB 2.0 Type-C port, but for a USB 3.0 Type-C port you'll get about gigabit maximum speeds. In my LAN I tested this at 980 Mbps downstream and 940 Mbps downstream on a Thinkpad T480. I can also confirm that the adapter is rated for at least 90W USB-C PD, with the caveat that 90W is the largest charger of its type that I own. Considering how close it is to max, I wouldn't doubt that it could handle the full 100W given you have such a large PD charger.