I don't mind calling the connector an RJ45, but calling this thing an "RJ45 dongle" makes my eye twitch. It's an Ethernet dongle - RJ45 can be used for a lot of other things. For example I've seen "RJ45 dongles" that convert USB to RS232 serial for the console ports on a lot of networking equipment.
At least they didn’t call it a wired WiFi dongle.
I did wired WiFi for CES one year. Made having our iot devices on WiFi on the floor much better than other vendors. It’s a long boring story but it was a fun hack.