Well, in about 30 seconds, all he would've had to say is "Everyone knows Sun and Moon are about Alchemy. These are all the religions and belief systems in history and alchemy that refer to the sun and the moon, most of it has to do with life, death, and rebirth, and thus, we get the franchise being rebooted from "rebirth".
So much of the video was him repeating himself, over and over and over and over and over and over and over and over and over and over and over and over again while also meandering around, not connecting any of his ideas (or even presenting it in a way in which the ideas were connected logically so he didn't have to keep saying "add it to the cork board" like an idiot). Then you just had the random dinking around which had little to do with anything at all... You also had all these REALLY unconnected ideas just being thrown into the theory because... "hey, it's kind of similar!". Nevermind that a lot of cultures and religions around the world use a lot of the same imagery and themes (like the sun and moon, or a trio of Gods... or four Gods... Heck, China or Japan has the "four Gods" thing with the turtle, the lion, the dragon, and the phoenix. Oh hey look, they phoenix is for rebirth... and there's a lion there... and one of these Gods is supposed to be evil and stand for death and destruction... as well as one that stands for the earth and... hmmm... noticing a pattern here? ha ha), so it's hard to believe it's little more than a "coincidence", especially given the way Pokémon has always been and probably always will be (no deeper than the kiddie pool).
I seriously doubt we'd even get a "reboot". Especially since every single game IS a reboot. You're a new kid in a new region with new Pokémon doing the same thing you've done every other game. Each new game is a reboot. Unless you (or the guys who made the video) mean they'd be remaking red/blue/green/yellow... in which case... we already had that once... Leaf Green, Fire Red... ORAS... HGSS... Another few years, we'll prolly get remakes of BW and B2W2 as well.
I mean, sure, the information is interesting, but I seriously doubt anyone at Nintendo did that kind of research on anything. Or even did a lot of research on Soleo (or however you spell it or whatever it is) for the "typing". Their research probably went no deeper than "Hey, Alchemy is kind of interesting, what can we do for Legendaries?" then they came across the basics of the lion eating the sun and it stood for the purifying of metals... so... it's a Steel type. And since Legendaries so commonly have psychic as a type... it's a Psychic type.
It's fun to speculate, but I think people are giving Nintendo too much credit. I mean, they made a Pokémon that literally looks like the sun... into a Rock type. "Solrock" and Lunatone... both Psychic Rocks... one isn't fire... strange typings are also fairly common among their Pokémon. As well as repeats. But, I'm sure they do get a kick out of all the fans thinking about it way harder than they do and coming up with theories.