CONFIG_SUPERH64 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
default or selected kernelversion does not have config value CONFIG_SUPERH64.
Result is shown for kernelversion 6.9.9

CONFIG_SUPERH64 (not configurable)

configname: CONFIG_SUPERH64

Linux Kernel Configuration
└─>SUPERH64
In linux kernel since version 2.6.12  
selects
CONFIG_HAVE_EXIT_THREAD
CONFIG_KALLSYMS