Again, that's invalid. "There is no reason room temp superconductors are impossible" is a proposition about reality, that, among all possible knowns and unknowns, there exist no reasons entailing their impossibility. The truth value of this proposition is literally unknown therefore you cannot assert this as if it's true.

My correction was that you should say, "there is no known reason ...", which is instead a proposition about our state of knowledge. This is a correct and accurate claim.