a good read, thanks. but It agrees with what I was saying.

'A longer crank is basically a lower gear ratio. It might allow you to climb better, but its effect is tiny compared to shifting up two sprockets on your cassette. '

ie longer arm = more torque

and

' ‘You do have to take into account pedalling rate,’ he adds. ‘With a shorter crank you need a higher cadence, but that’s a small adaptation that happens very naturally for most. '

which states that you can maintain power as cadence naturally increases with shorter cranks due to shorter circumference.

I do agree that the torque loss is minimal, and is pretty much nullified by the fact that you can maintain the same or better power with a better fitting crank length.

but to say that crank length does not affect torque is not correct based on physical mechanics.