I get this working. But there's seems to be only one Armature type.
(I am inside Blender 2.9)
Yes, that is correct, but if my memory doesn't fail me, there always used to be only one subtype (Single Bone) and now they just left that out, because that makes more sense; if you can only add a single bone, why make that extra click :)
I may have failed to mention in that lesson that I have several add-ons that adds options to my menu. (which creates a sub-menu)
But that option is the 'single bone' shown in the video lesson.
(Thanks spikeyxxx)