I found the commentary on this video rather confusing – the description seemed to wander between “R = c x t” as being defined as the radius, diameter and circumference of a circle.
In the illustration the larger circle was stated as having a circumference of 1/R and also being greater than R itself of the smaller circle – the winding path was an additional layer of confusion!
I understood string theory to be counter-intuitive and decidedly strange, but this level of weirdness is difficult to accept.