^^
Haven't watched the video, but it's par for course that insane theories are going to start coming out so let's be real here for a second, this isn't about appeasing the angry fanboys, this is about money.
Wonder Woman 2 will make lots of money whenever it releases, but in 2019 we have the Avengers, which is the culmination of three phases and 20+ movies in the MCU and the finale of the Star Wars sequel trilogy, so realistically at best it will be no. 3 regardless of how good it is.
In 2020 however, there's no Avengers, no Guardians, no Jurassic World, and probably no Star Wars. There's no obvious contenders announced for that top spot yet (Avatar 2, maybe, but it's questionable how much enthusiasm it will muster after 11 years) so WB is betting that Wonder Woman can be not just one of the bigger ones, but could possibly explode to be the biggest movie of the year.
That is the only reason for the delay, anyone spinning this other ways is just baiting for clicks.