AFAIK the NVFBC patch is no longer required for new Sunshine versions thanks to https://github.com/LizardByte/Sunshine/pull/2471.

However, NVIDIA say that "The NvFBC desktop capture library does not have native Wayland support and does not work with Xwayland" (https://us.download.nvidia.com/XFree86/Linux-x86_64/565.77/R...), so I guess it's of no use for Wayland users.