Seriously? Universes beyond?

Quote from Caerwyn_Glyndwr >>

In the context of Magic the Gathering, “Universes Beyond” is explicitly defined as “intellectual property Wizards of the Coast does not control.”

 Your source actually says "For now, we're reserving the Universes Beyond branding for worlds outside those built by Wizards of the Coast." However, for D&D, given the number of 3rd party products that fit under that definition and don't have anything like that branding, I suspect the actual concept is "worlds that were not originally conceived as D&D settings"