No... If any mortal witnesses Xiao unleashing his true power, it is certain to be under the direst of circumstances, and they will be extremely lucky if they survive the ordeal.This is not because Xiao seeks to harm people. Rather, since Xiao wages a constant war against dark forces powerful enough to devour Liyue in its entirety, any bystanders who witness him in the heat of battle are likely to end up as collateral damage. Not that this is a secret worth going around silencing witnesses for.