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I think 'unrideable' might be eronious.
There is a video about a bike with backwards steering (turn bars left bike goes right) which shows up in the related videos box after you've watched that one and in that video it was found to be necessary to relearn to ride the bike, something that an adult struggled with but that a child was able to do a lot more readily. Once they had learned to ride the backwards bicycle, similar relearning was needed to return to riding a normal bicycle.
I imagine the bricycle might be similar, that there exists a technique, which is quite different to the normal technique of cycling, which would make it rideable.
Physics hurt my head, this all makes sense but yet... no.
https://www.youtube.com/watch?v=rNQdSfgJDNM