What does "NVIDIA RTX and DXR driver-enabled GTX series graphics cards" mean?

As of UE5 emulated raytracing (10-series cards) is no longer supported for raytracing features. You need an RTX card.

There was an old thread from Early Access which had some solutions to working around this but I’m not sure that any of them still work: Solved : Cant Enable RayTracing in UE5 (gtx 1060)(Nvidia Pascal)