If the Comacheria had no boundaries, how do you know that "Austin - Travis County was most definitely Comancheria in 1830" -- your words. Self-contradictory argument.
Map isn't BS. It's supported by a number of maps, some of them of quite early origin, that delineate the territory the white settlers of Texas understood as the Comancheria. Sure, there were no fixed boundaries. But we do know the Comancheria ended where other tribes controlled the ground -- and the Tonkawa controlled the Travis County area. Just was the Waco controlled the McLennan County area. No Comanche lived in either place. They raided there. It was enemy ground.
You appear to be among a group of history enthusiasts who for over 40 years have regarded the writings of T.R. Fehrenbach as inerrant scripture. Fehrenbach was a prolific author and impressive amateur historian. He had a bachelor's degree in the subject (same as me), but no advanced degrees in history. He was also a sometime journalist, writing for newspapers and magazines. But his primary background was in insurance. He founded and made his principal living from the Royal Poinciana Insurance Company of San Antonio.
Over the past 15 years, professional and more highly academically credentialed historians have poked some holes in Ferehnbach's work. A principal criticism is Ferehnbach's apparently racist tendency to interpret Texas history as a long and gradual ascendancy of superior Anglo-Celtic people over the barbarous and backward Hispanics and Indians.
Fehrenbach is an important voice in the whole schema of Texas history. He is not the only voice, or even the foremost voice. Broaden your reading, froginaustin. It'll help you recover from the koolaid you drank in 7th grade Texas history.