Let's take a quick look at China's 4,000-year history to see what, exactly, is meant by "not invading another country." China's first known dynasty was the Xia Dynasty, which ruled a small area along the Yellow River. They expanded over one of the world's largest land masses, not by consent but by conquest.
In all of these shaky and shifting rationales for defining unwilling people as Chinese, one thing is missing: the consent of the governed. For the butchers of Beijing, the Humpty Dumpty "authority" to define Chinese doesn't come from any dictionary; it comes from the barrel of a gun.