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>At which point is something like this not a bicycle but rather a motorbike?

When an engine is attached to the drivetrain.

>It also has an engine, “but it only drives the alternator and charges my cell phone,” says the inventor.

Although you could argue this is actually not technically a bicycle, since it sits on the tires and does not require momentum to balance.

The real coup de grâce of this whole thing is when he comes out and publicly admits the only reason he built this was to troll the internet into getting into huge arguments about what the definition of "bicycle" is.

Sophisticated Internet pedants have already moved on, though, and are currently arguing about whether or not the Kleine Johanna is a sandwich.

he cycles it, so it's a cycle.

though the addition of 2 stabilising wheels challenges the "bi" part of the bicycle.

Same concept doesn't effect calling a bike with training wheels a bike tho

So a training bicycle.

Most people call a cargo bike a bike even if it's often technically a trike.

Closer to a pedicab as far as definitions go.