The Xbox numbers are way off because they are essentially saying that its selling 50/50 America/World which just isn't even remotely close to reality. Therefore it's hard to take his discussion of future sales seriously when his current numbers are totally fictitious. A common flaw I see among gaming articles is the idea that you can have realistic conversations based on completely backwards false information.
Not just that article, but here as well. I believe that then increase the x1 has seen this year has been solely in the US. EU and rest of the world just dont care for the extra power of the x1x. If they ever release sales numbers, it will be over tracked here a fair bit.
It takes genuine talent to see greatness in yourself despite your absence of genuine talent.