Aquinas is KIND of an authority for Catholics on the Truth of our theology.
But he is almost THE authority for the content of our doctrine. Even if, arguendo, we stipulate that the dogma is false, whenwe look into what exactly is falso about it, we have to go to Aquinas to find what the particular false teaching is.
If I were to say that automobiles run on hummus, and you were to say that I say they run on beanspouts, both statements are wrong, but you are also wrong to say I was saying my car ran on beansprouts.
All Im doing here, other than disagreeing with the post, is saying that I never said my car runs on sprouts. I said it runs on hummus. No one who keeps on arguing about sprouts is going to help me with my hummus problem.