Sadly with The Talos Principle 2 they moved their entire studio to the Unreal Engine 5 and retired their own engine in the process. Apparently they lost a few engineers working on the engine and also couldn't have kept up with modern engines without some serious investment (no pun intended). On one hand it's probably for the better as we got a really pretty game where they could focus more on the game instead of bringing the engine up to speed but it's also sad to see the entire industry converge around engines like Unreal.