5,000 is also a ridiculously large number for a country not at war. You only need a few drones if you wanted to analyse them, and the Iranians wouldn't be announcing it. China has companies selling military drones for export that haven't been bought by the PLA, you'd think they'd go to them first before Iranians.I think our Iranian friends are using it as a flex, ie look we are together also with another yankee adversary. At the most the Chinese may have bought a small batch to see its effectiveness is as reported.
From what I know there will be a highly detailed and comprehensive report about all the weapons and tactics employed by all sides in this war, it is the Chinese way.
Either the website are outright making the news up, or they are misattributing sales to Russia. Unless China is buying them to give them to Russia, which would be a strange thing to publicise.