Basically there are two machines sort of being discussed here. Machine Shop has a CNC Mill (a Haas VF2), and Woodshop has a CNC Router (by Multicam).
If you want to use the mill (for metal etc.), it’s Nick’s class.
If you want to use the Multicam CNC router (for wood only at first), it’s a Woodshop CNC router class (and it actually doesn’t require Woodshop Basics unless that has changed recently).