Nope, the OptiX 7.1.0 Release Notes still contain this:
All NVIDIA GPUs of Compute Capability 5.0 (Maxwell) or higher are supported.
That looks to be an oversight, maybe left over when trying to suppress CUDA 11 deprecation warnings about SM 5.0.
https://docs.nvidia.com/cuda/cuda-toolkit-release-notes/index.html#deprecated-features
You should be able to fix that locally. Just search all OptiX SDK 7.1.0 CMakeLists.txt files for 60.
Looks like OptiX SDK 7.1.0\SDK\CMakeLists.txt sets it. Check lines 165 and 208 which set the architecture to SM 6.0
Change that to -arch sm_50 and -arch compute_50 respectively and you should be fine, except for CUDA 11 deprecation warnings.