The use of the word "sunset" as a verb in posts like this is fucking infuriating. Yes, software types know what it means, but this is a consumer product with tens of millions of users, who have no familiarity with that term. It's a weasel word. The way to say this is in plain English. We're closing, shutting down, turning off, discontinuing, or something.
It is therefore presumably not the primary consumer-facing announcement of the shutdown.
Hopefully they will use one of the terms you noted, or something similar, for that announcement.