I don't see it as a warning. To the contrary, it just means there are much bigger fish to fry, and the Chinese know it.
Very likely indeed that the Chinese had the time to fully assemble and dismantle it, or even had already known everything about this drone.
I remember of one US missiles that get lost in a bombing campain of Afghanistan. The Chinese, among many other countries, paid handsome money the people from Afghanistan to find any US military thing and transport it to China ( or their respective country) for 'study'. I suspect that among all the drones used in the Middle East, some have been bought by Chinese for 'study'.
Last edited: