I agree with him that when simply comparing 60fps to 30fps, 60fps is always the better option. That said, i completely disagree with his claim that 30fps is ALWAYS, no matter the benefits or situation, a bad thing.
If we were talking about a PC game then yes, playing at 30fps is like having your balls scratched off by a particularly pissed off cat, but that isn't the case on consoles. By the time you go through the game's imput lag, your TV's, your brain's own 200ms delay and the sluggishness of an analogue stick vs a mouse, the effect is considerably smaller (not gone by any means, but certainly less of an issue). By that point 30fps + the gained resources is often a better option than 60fps alone.
RAD's PR statement is total BS though 30fps for no reason other than to feel more "cinematic" it utter nonsense. They should just be honest and say why it's 30fps; because they believe that the benefits of the resources gained from choosing 30fps over 60fps better suited the game they wanted to make.