CONFIG_ARCH_AAEC2000 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
default or selected kernelversion does not have config value CONFIG_ARCH_AAEC2000.
Result is shown for kernelversion 5.4.69

Agilent AAEC-2000 based

configname: CONFIG_ARCH_AAEC2000

ARM system type
└─>Agilent AAEC-2000 based
In linux kernel since version 2.6.13 (release Date: 2005-08-28)  
This enables support for systems based on the Agilent AAEC-2000