Yeah. It's not his fault his opponent missed weight; he did everything he was supposed to do to win the championship.
The fight may not've been for the belt, but would you really have denied that Travis Wiuff wasn't the true Bellator LHW champion after he beat M'Pumbu? Or that Yves Edwards wasn't the uncrowned UFC LW champion in 2004 after he beat Franca and KO'd Thomson and was on a 6 fight winning streak in the UFC? Or that Filho wasn't the true winner of the Pride 2006 WW GP (he beat Misaki on the same night that, and right before, Misaki beat Kang for the tourney)? It might not be official and on paper, but it doesn't change the fact that the only true way to become a champion is to beat the champion, which all of these guys did.