In the Kotaku article where he supplied the docs, he said nothing about whether it is true or not, but according to Kotaku's own source, it is.
"SuperDaE, for example, offered nothing about the machine's name nor the look of the console or controller. He said nothing about the idea of the new Xbox requiring a constant online connection, something most recently reported by the respected Edge magazine. (One reliable Kotaku source has told us it's true, though, again, plans can change and the strictness of that online requirementwould it tolerate a spotty signal?remains unclear.)"
Since the article he has said that the always online/no used games rumors are false.