This article sucks a lot but it does discuss the fake "Tanks in Shenzhen" story from last week that turned out to be untrue: https://www-m.cnn.com/2019/08/11/asia/hong-kong-fake-news-intl-hnk/index.html
I still don't know if this current story is fake, by the way. I'm just pointing out that a story a lot like it came up before and was fake.
I have done further research into the matter and have come up with one additional source from the New York Times on the matter. Even pro-communist tabloid Global Times has reported this.
I'm going to give it the seal of approval.