Apsaras come from india. It is not just in china, it is in south east asia as well. using apsaras & indian religion, theories to steal indian clothing, jewelry is low behaviour, nothing justifies it. You use dunhuang to steal EVERYTHING indian. things which are not even in the murals, you use budhdism & indian dieties to steal from india.
By your logic, If brilliant art born from cultural fusion is "appropriation", then didn't the Apsaras in Indian Buddhism also "appropriate" Greek culture? Dunhuang's Feitian are a world heritage treasure — for China and all humanity. Isn't the same true for India's?