I just watched the video but without tone and it looks as if she is purling in combination style and in knitting she changes between inserting the needle in the front leg and then back leg. I think I should watch it with some more time and with the voice :-DDD After this I only need a video how to set brioche up in combination style. Thank you so much for researching the video.
And you also knit combination??! This is so cool! I only know one other person who knits in this style (she works very seldom in a yarn shop in the near) and I must guess at so many things in patterns, as they are mostly written for "normal" knitting.
Looking forward to hear more of your brioche investigations :-D