The video game industry has reacted with shock and anger after Xbox shut down several game studios today, May 7, 2024 including Arkane Austin and Tango Gameworks, the developers of Redfall and Hi-Fi Rush respectively.
It could get delisted in the future if there were any licensing deals, although that can happen for any game. If you already own it on Steam you'll be able to keep downloading and playing it indefinitely.
The games are the property of the publisher (in the case of Hi-fi Rush, Microsoft Games), so (baring licensing issues like music) as long as the publisher is around the game should still be around.
Hifi Rush is in Humble Choice this month, and I noticed they have a redemption deadline which is a bit out of the ordinary. So it's possible it'll get delisted, or maybe Humble is just playing it safe with the keys they have.