Already did above and in another thread (my posts can be a bit verbose).
EDIT: this command
cat /sys/kernel/debug/ieee80211/phy0/ath10k/wmi_services | grep -E '(AIRTIME|PEER_STATS)'
is useful if you start digging into different devices/drivers.
If anyone is interested, skim through this thread starting at Dec 21. There are some details there about how ATF is different between devices (and drivers), how to disable it if you compile your own driver (but nbd already showed you how to do that above - see also this post in this thread one to two years ago...), how to get ATF on the r7500v2 with the ath10k-ct and how to enable/disable ATF via the ath10k-ct fwcfg api (but you will have to adapt that patch for the r7800 and compile your own driver). This thread is not a guide - just me trying to figure out why wifi sucks.
FWIW AQL/ATF can make wifi better - but it is a bit bugged atm.
As mentioned above /sys/kernel/debug/ieee80211/phy0/airtime_flags apparently does not disable it revert it to the round robin scheduler, nor does playing with ATF settings in hostapd (currently). I hope this changes in the future as well.