I didn't say it in my previous post but I was thinking of that exactly. the setting and art style looked very similar to the order. i was even thinking that the similarity to the order might have been the primary reason the project was canceled. I can imagine the internet memes already making this comparison just after the game's announcement.
This video seemingly is from January 2016. Probably would have cancelled it/changed directions sooner if the order was the primary problem with it.
Looks like The Order x Assassin's Creed.
Im kind of surprised how polished this demo looks. Usually the cancelled projects we get to see dont look like this.
Probably a quasi vertical slice to help sell the vision. Doubt anything outside this small moment was beyond early development.