I tried to watch it but right now I am playing SS and I am trying not to spoil myself too much. Seeing that I do know Impa and old lady spoiler I thought I could be safe but I don't know details on Groose involvement and I want to keep it that way. :XD:
After skipping some... it seems to stretch a lot from a few passages from old prima guides. It is interesting still, as it brings an idea of how the war could have started in the Hyrule Kingdom some years before OoT adventure took place. I also find interesting the idea that bong Bong was a Sheikah, that the sheikahs were divided between loyalist supporting the unification of Hyrule and rebels wanting to remain independent. Giving meaning to the Torture chambers found on its ground.
Interesting they handle the Twili being Sheikahs ad Impaz being the descendant of the last Sheikah (unless you count Zelda) in OoT era. Their absence was noticeable. i remember how Kakariko Village seemed quite different and yet the Hidden Village seemed more similar, perhaps for the sign to it. Still even though we see an eye on the throne it is not exactly conclusive as it also resemble other things like past (and future?) Zelda enemies, for example Vaati.