I disagree, they're explicitly claiming it's a "Swiftie-verse" thing, not something that has existed for decades already.
> The fact that it has an "Easter egg," in this context, is more of a more meta nod, rather than it being a hidden thing you have to find
I guess what I'm trying to say is calling something an "easter egg" and then describe exactly how to find it, makes it very not an easter egg anymore, you don't receive instructions for how to find the egg before you go searching for it, that would ruin the whole idea.