Zhouyang's complete immortal record is only archived over at Chi Ming Immortal Palace.
He usually travels in the Chi Ming Immortal Realm, entering and leaving Immortal Cities. As long as he doesn't encounter a Tribulation Crossing True Immortal from Chi Ming Immortal Palace, he's not afraid of anyone uncovering his true origin.
Therefore, he is not afraid of being exposed when he tells the 'Master Xuan You' before him that he comes from the Chixiao Immortal Realm.
Even if this 'Master Xuan You' visited the Chixiao Immortal Realm a century ago, he wouldn't be able to determine if Zhouyang was lying from realms apart.
