[kazinator]

Your interpretation of the trail must have missed something. We know that all turning of a bike is via countersteering. You wouldn't be able to turn right on a bike whose steering is locked out from turning left. (See video upthread.)

[whycombinetor]

You can ride a bicycle that is locked out from steering at all. (You can ride one-footed on anti-rocker (2 wheel) inline skates, with some practice).