This is not true. A) personal ID numbers are not publicly available (you could certainly get your hands on some, but I doubt a lot would know Xi's ID), and B) more importantly, nowadays ID verification in China uses more sophisticated methods, e.g. in order to not be restricted when playing games, users need to prove they are over 18. The user would permit the game to verify through a payment provider such as Alipay (I don't think one would even need to give their ID to the game, as it is handled by Alipay which has done KYC already).

Although I suspect such ... "innovations" ... would soon get to the western world including UK.