It implies that cuDNN 8.1 requires CUDA 11.2 which according to the release notes is not true (10.2 and above should be supported according to the matrix).
My guess would be that this check is too strict cudnnGetCudartVersion(); is defined as
The same version of a given cuDNN library can be compiled against different NVIDIA® CUDA® Toolkit™ versions. This routine returns the CUDA Toolkit version that the currently used cuDNN library has been compiled against.
so the check looks to be rejecting CUDA 11.0 because cuDNN 8.2 was built agains CUDA 11.2. That said I think this would have been reported somewhere already if its true.
Anyway easy test would be to install cuDNN 8.0.0-8.0.3 as these should have been built against CUDA 11.0. You shouldn’t need to rebuild as cuDNN is dynamically linked.