default or selected kernelversion does not have config value CONFIG_ARCH_INIT_TASK.
Result is shown for kernelversion 6.7-rc3

CONFIG_ARCH_INIT_TASK (not configurable)

configname: CONFIG_ARCH_INIT_TASK

Linux Kernel Configuration
└─>ARCH_INIT_TASK
In linux kernel since version 3.1 (release Date: 2011-10-24)