As I understand it almost none of the code in \botai was used in FritzBot. I also guess that Bobots developers avoided that code too. Logically I can't see Omnibot using it either. That code was created most likely in the attempt to create a single player version like RTCW SP. But the SP version of ET was not completed ASAIK when Splash Damage and ID abandoned ET over issues like graphic textures for terrains (What in ETQW are megatextures). You could post a question in
Splash Damage's editting ET forum to see if anybody has tried using that code and what is missing. Learning the code might be useful to get some ideas but not useful to use directly.