It's impossible to systematically lie to an entire country's population about the country itself. It's never happened anywhere on Earth and will never do so with current technology. It is however trivial to lie about other countries, which I like to always keep in mind. Think for a moment what reason a Chinese person would even have to dislike their government, when they are clearly doing a good job and actually solving their problems. Even the victims of Tiananmen weren't those often talked-about "pro-Democracy" students, most were anti-liberalization communist worker protestors.