Why no CUDA 11.x on Power9 with RHEL7?

Any idea why NVidia stopped supporting CUDA greater than 10.2 on Power9 while running RHEL7? Seems odd that I can run CUDA 11.x on x86_64 with RHEL7 but not Power9.

Anybody have a working hack to get CUDA 11.x on RHEL7? I’d rather not upgrade these Power9 boxes to RHEL8.