default or selected kernelversion does not have config value CONFIG_ATH9K_MAC_DEBUG.
Result is shown for kernelversion 6.2.5

Atheros MAC statistics


Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Atheros Wireless Cards
└─>Atheros MAC statistics
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This option enables collection of statistics for Rx/Tx status
data and some other MAC related statistics