Thanks for the suggestion, @PierreB - I am checking with the lead author to see what material is still available as he performed the experiments.
But this will not be the last paper on the topic and it was not the first. Have you seen this one?:
Schelbergen et al Swinging motion of a kite with suspended control unit flying turning manoeuvres
We included some nice footage and even have a video as supplementary material.