Wisconsin also seems conspicuously absent (I guess UW lists their official colors as "Cardinal and white" which may explain it)
Pedanticly speaking:Garnet. Not red.
Oklahoma - Crimson and cream
Iowa State - Cardinal and Gold
Alabama - Crimson (obviously) and white
Ohio State - Scarlet and white…and silver……and black
USC - Scarlet and Gold
Arkansas - Scarlet and white
Indiana - Crimson and cream
****braska - scarlet and cream
ONLY Georgia from those pictured actually lists RED as an official color. So yeah, they just straight up didn’t want to add ****braska. It wasn’t a technicality.