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To be honest, if you are unable to ride a bicycle with a front brake only without face planting then I would seriously consider you trying it yourself.
His point isn't really that he's not able to ride a bike with only one brake, it's that by riding with only one brake on a bike with a freewheel you have no redundancy system in place for the event of brake and or cable (he he) failure
Might I recommend cycle training?