Out of curiosity, the Call of Cthulu Core books are each at 100+ in the past month, Daggerheart Core does not have a number, Pathfinder 2E Player Core is at 50+, and the Stormlight Archive Starter Set is at 200+.
Well, given that the DMG has a fairly full (as in, about as much detail and info as the original Folio) presentation of Greyhawk as a Setting to run Campaigns, thing is newer players in the past two years have been primed to be open to borrowed Greyhawk nostalgia by WotC.
I mean, granted as far as it goes, I don't see any of that as a reason to not suspect this could be for Season of Champions. I would expect either a full veto of this material or adoption close to as is, not much back and forth.
As someone who finds the results intriguing, if not even promising, I do think it worth taking then with some grain of salt as partial and somewhat obscure. But I would have said the same thing about ICv2 at any point, while taking it seriously as a source of some information.
My main caveat...
Yeah, honestly I have doubts that "being a Lich" will make it through UA: if they wanted to explore the mechanical approach, really think they ought to have started with a less extreme narrative example.