Like it or not folks, he is objectively a DISPUTED champ now, Cejudo has a claim to it after beating him because he is willing to immediately rematch at 135, if TJ ducks him its one of the all time biggest ducks.
Him losing at 125 absolutely affects his status because the guy who beat him wanted to do the fight at 135 in the first place, after beating DJ one of the first things Cejudo did was called TJ out and said hes coming to 135 for that belt. TJ got selfish and made sure it would be at 125 so he wasnt the one risking a belt. Now he has to defend it to be the undisputed champ.