Earlier quoted context omitted.
> you can't actually pedal this thing... sort of foundational to the concept "bicycle". Interesting. Just wondering - what does "pedal" mean to you. Explicitly spinning and explicitly with feets? Are any of those not considered bicycles to you? -Elliptical bicycle -Treadmill bicycle -Handcycle
The first two don't go anywhere and therefore aren't a problem. The third is just a variation of bicycle. What is your point here?
They're probably talking about e.g. an elliptigo, which does go somewhere. Although I can't imagine it ever making sense to motorise one.