Confidential Compute memory attributes are reported as zero on unsupported GPU

Developer Tools Other Tools System Management and Monitoring (NVML)
1

Title. On a 960, nvidia-smi reports:

Conf Compute Protected Memory Usage
        Total                             : 0 MiB
        Used                              : 0 MiB
        Free                              : 0 MiB

But the docs say Ampere or newer.