@bisonhero: I use it and mean it in a world changed by COVID. There's no good quick vocabulary for it otherwise. It's kind of odd that people take it to mean COVID is over. Like? Obviously not? But language is werid that way, like you point out. I think it's mostly a semantic instinct thing but it should be easy to suss out the context.
The real answer has already been provided by Gears of War but we don't have our equivalent to E-Day.