kernelconfig_penguin
default or selected kernelversion does not have config value CONFIG_ATH9K_DEBUGFS.
Result is shown for kernelversion 5.9.9

Atheros ath9k debugging

configname: CONFIG_ATH9K_DEBUGFS

Linux Kernel Configuration
└─> Device Drivers
└─> Network device support
└─> Wireless LAN
└─> Atheros ath9k debugging

Say Y, if you need access to ath9k's statistics for
interrupts, rate control, etc.

Also required for changing debug message flags at run time and for
TX99.