Chinese pole gymnastics is very rare. I think it is reasonable to rule it out. Also, the marks on her thighs from the bar are solely perpendicular, whereas Chinese pole forms occur at multiple angles and would create wider angle marks on her thighs. Also, unstable and moving is fine when you are used to it. The uneven parallel bars move quite a bit during rotations, but as that is a predictable movement, it is learned and accommodated for in training. It is a world apart from a jerky coaster in the dark where you have no visual compensation for balance. As for possible, I trust my gymnast source's evaluation that her plan would be unsteady and slip prone (meaning she runs into Shinichi or collides with the guy while trying to loop him) if she did not use the relatively stable brace that Shinichi demonstrated, which of course creates the why did Shinichi not notice conundrum.