Is Xbox actually shutting down or is that just noise?

Your games aren't going anywhere either way. The library is on your account, and Microsoft has said publicly there's another console coming. The multiplatform stuff is about where their games get sold, not about killing the box.

Noise. Microsoft hasn't announced anything like that. What's real is that a lot of their games now come out on PlayStation and Switch too, and console prices went up, so people read that as Xbox giving up. Game Pass and the consoles are still very much running.