You mean the Chinese government might be targeting imported luxury goods as retaliation?
We know that China has started the procedures to aim at pork and dairy products from EU. We just heard the news that the next on the list will be the large ICE vehicles. Have not heard any news on targeting luxury items, even though banning them, those made in France and Italy in particular, has been a popular request by some public opinions.
Other than believing that the government is clamping down import, the drop of sales of western luxury goods in China can also be attributed to factors such as domestic brands gaining popularity, and consumers spending more cautiously.