I thought the video was pretty fair, as he repeatedly said that it's not a reflection on Dark Universe's quality, and he mentioned how much of a people-eater Monsters Unchained is (compared to the other headliners).
Isn't it pretty objectively true that it's the least-busy of the four lands?
Now, if the larger point is that Dark Universe shouldn't be used to either bolster or undermine a case for a "darker" Villains Land, then sure.