Sowell has never claimed to be the arbitrary of truth. He provides empirical evidence in his books.
I am not a Hoppean, Rothbardian, Misean, Sowellian, Friedmanian, etc... I am a libertarian.
While I hold each of these economists in high regard and they have each influenced my perspectives, I don't take everything they say as 100% gospel. I am not strictly bound to the teachings of one political theorist or economist. No single human has a monopoly on truth.
For a real economist try Robert ( Bob ) Black
https://m.youtube.com/watch?v=TGW0R0l0mS0
Playlist
https://m.youtube.com/playlist?list=PLCSrktdzoeQ8ZnMgEwvFtQOnGmnIgCvGa