It is public information though that the US offices are closed and we don’t have to be back until July (it’s called “voluntary WFH” but they won’t even let us back in to pick up stuff we left on our desks).
I assume that so long as you're officially working out of an office in a location and the company won't change your payroll status, that's where you're working out of as far as taxing authorities are concerned no matter what the "public information" is. I'm guessing it's not even especially legit but very few entities are pushing on it at this point--except in cases like this one where there's a big advantage to employees pushing to switch their work location.