default or selected kernelversion does not have config value CONFIG_EXFAT_DISCARD.
Result is shown for kernelversion 6.8.2

enable discard support

configname: CONFIG_EXFAT_DISCARD

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>enable discard support
In linux kernel since version 5.4 (release Date: 2019-11-24)