I think they’re rationalizing it by saying that’s a juvenile sandworm. The larger one with the round mouth is fully grown.
They probably just wanted a design difference between a smaller human scale threat and the massive ones that eat entire structures like spice harvesters.
Endeavour’s current iso is still KDE 5 and X11, but if you do an online install it will default to 6 and Wayland. Just make sure to connect to the Internet before starting the installer.