Forget about it, the rumor started from nowhere! It s a nonsense with a totally outdated F-5 fleet...
According to the PRC military expansion, an upgrade for the Mirages would be surely considered as vital though. These birds are better interceptors than most of F-16 standards in town. If it s a question of price, France is not the only country that can upgrade the M2000-5 to the best M2000-9 multirole standard.