I especially liked the tid-bits on the origin of the "fajita" moniker. I wish he would have pointed out that "chicken fajitas" is a gringo oxymoron. "Fajita" in Spanish usually means "little girdle" and literally refers to the size and position of this cut on the cow.
The reference to the south Texans heckling the dude in Austin that said he coined the term / cut "fajita" is revealing. Wood grilled skirt served on tortillas (corn or flour) with fresh pico de gallo is as Norteno as you can get and certainly has been around for a very long time.
Sour cream, black olives, blender made guacamole, cheddar cheese etc. are gringo additions.
Just my $0.02.