So assuming his quote is wrong until he is prooven right is more logical and unbiased? Sorry but I don't get that.
I'm not asking anybody to blindly believe that statement. But you should give him at the very least the benefit of doubt that he may know what he is talking about. I'll call that unbiased.
I don't have a secret console agenda or something along those lines. If anything I try to defend the developer. I think it was a great interview where he spoke quite freely about the problems that occur when developing for the new consoles. He seems to be a pretty knowlegable guy that talks straight. Plainly dismissing his statements does not seem fair to me.
When all historical evidence shows that a PC with similar specs performs at least as good when running the same game, then yes, actual "evidence" is required to substantiate it. Console optimizations are important for specific aspects of its performance, but all empirical evidence shows no signs, or even hints at such as large gap (2x).
Do you not see how conveniently ignoring the empirical evidence, basing the pillar of your argument on a quote (appeal to authority), and then creating an unfalsifiable scenario in which it is impossible for your opponents to "prove" anything to you is the basis of a very poor argument?