https://wccftech.com/atomic-heart-developer-seems-to-deny-rumors-of-games-delay-into-q1-2023/

Earlier today, Polish website XGP cited an anonymous source from Atomic Heart developer Mundfish that said development on the game had stopped for a month when Russia invaded Ukraine, potentially leading to a release date delay to the first quarter of 2023.

Mundfish, a Russian studio, quickly issued an official response on Telegram saying that the development of Atomic Heart never stopped. They didn't outright deny the delay rumor, though that appears to be the implication here.