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.
But ethernet is also used with different connectors so that wouldn't be specific enough either.
Maybe we can all agree to call them Ethernet over unkeyed 8P8C dongles.
At least they didn’t call it a wired WiFi dongle.