There are several variants of Payne’s patent figure 5 which describes two pulleys that are connected to the respective generators, and a tether connecting these two pulleys to the kite flying crosswind:
Kiteborne’s variant (on the video) where there are also two pulleys but only one generator.
I sketched another variant with two winches and two generators, one tether being stretched while the other tether being slack, and vice versa.
All these variants are discussed at What is possible with Payne's patent US3987987 figure 5?
I suggest that the currently discussed variant is also posted on the topic above.