They give a little history on why some blades were made illegal, and they interview the guy behind Knife Rights ( https://kniferights.org/ ), the organization that was a key part of un-screwing Oklahoma's knife laws.
Yep; carrying them used to be a felony, but the Legislature changed that in '15 or '16. They also added a preemption clause, so regulating the carry of knives in Oklahoma is strictly the domain of the Legislature, and all local ordinances on the subject were rendered null and void.
“Bowie” knives were almost as illegal and the definition left a lot of room for interpretation. The new law that freed switchblades/autos also freed “Bowie” knives.