So. Food for thought.
There's a bit in the 2024 DMG, when it talks about gods and their ranks (page 74)? You have Greater Deities (think Moradin, Corellon, etc), Lesser Deities - "the creations, children, or servitors of the greater deities" - and Quasi-deities. That last rank includes demigods (half-mortals), titans (non-god creations of gods, such as the kraken and tarrasque) and vestiges (remnants of dead gods).
Empyreans in the video seems to fit the quasi-deity mold that the DMG. The write up says at various points, "Emyreans are the spawn of deities," "whether empyreans are idealized beings or vestiges of divinity," "inventors and their creations." All of these are basically just different ways of describing the different quasi-deities listed in the DMG.
I'm wondering if Empyreans are filling the niche of "fightable gods" at this point. Renamed because saying that you're going to be fighting a god is, well, has certain implications in D&D.