It's incredibly stupid, the original story had no merit. I'm seriously thinking that nobody actually even wrote about it in China.
Firstly, Chinese people all use WeChat so the idea of having airdrop on for everyone doesn't make sense. There are many many places of anti-government talk on wechat. It's just a cat and mouse game, they use different words for Xi and CCP.
The number of people in China who actually use airdrop and have it on, I would say is minimal. If i take me 100+ family members who all use iPhones or Huawei, the iPhone users, ZERO of them use airdrop. They all use WeChat.
What I think was happening was there were people going around sending out anti-government propaganda to ANYONE who had airdrop on. So a feature that many didn't know had on, suddenly started getting anti-CCP spam by probably a select few people.
This lead to complaints to Apple, and then Apple did something about it.
I'm so tired of westerners that think Chinese are stupid, and don't know. Chinese people are WELL aware of their history, they are WELL aware of chaos times, dictators, emperors, they learn that from birth a vast history of knowledge of how the past was. I would even say Chinese people are more educated than westerners on history as they have far more than we do.
TL/DR: Airdrop story is most likely false, as 100% of Chinese people are on WeChat. Few Chinese even know what airdrop is. More likely is that few bad actors airdropped to people who didn't know they had everyone open, thus complaints from users came in.