default or selected kernelversion does not have config value CONFIG_MAC80211_RC_MINSTREL_HT.
Result is shown for kernelversion 6.9.9
Minstrel 802.11n support
configname: CONFIG_MAC80211_RC_MINSTREL_HT
Linux Kernel Configuration
└─>Networking support
└─>Wireless
└─>Minstrel 802.11n support
In linux kernel since version 2.6.36 (release Date: 2010-10-20)
This option enables the 'minstrel_ht' TX rate control algorithm