CONFIG_ARCH_NUC93X is not available for the default architecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_NUC93X.
Result is shown for kernelversion 5.4.4

Nuvoton NUC93X CPU

configname: CONFIG_ARCH_NUC93X

ARM system type
└─> Nuvoton NUC93X CPU

Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
low-power and high performance MPEG-4/JPEG multimedia controller chip.