They're going off an outline and boy does it feel that way - it's Honest Trailers Vol 3 (seasons 6-8)

Honest Trailers | Game of Thrones Vol 3
Title Design by Robert Holtby
Epic Voice Guy: Jon Bailey
Produced by Spencer Gilbert, Dan Murrell, Joe Starr, & Max Dionne
Written by Spencer Gilbert, Joe Starr, Dan Murrell, Danielle Radford & Lon Harris
Edited by Kevin Williamsen

#HonestTrailers