Article pretty much begins by acknowledging they have no proof. That headline doesn’t care about such trivial things though. Goodness gracious. More panic inducing from the liberal media. Oh wait this is Breitbart. Whoops.
The video in the Breitbart link shows the evidence they have which is a news report out of the Falun Gong news network, notorious for their anti-Chinese government messaging. This religious group is a bit of a complicated story if you are not familiar but I would say they are about as trustworthy as the Chinese government itself, which is not very.
But the news story evidence is a social media video of an old lady with a Wuhan accent in a car telling her driver about an older man in the bed next to her when she was in hospital being put in a body bag still alive. She then claims this happened multiple times in that hospital.
While this may warrant some kind of investigation by police in one of our societies if this lady had reported and they thought she was credible, it is hardly proof of anything and could be just a tall tale.
The radio free Asia article cites a “source close to the funeral industry” with the surname Ma describes videos of screams from funeral homes, but the article could not verify them. So possibly more rumour.
I’m not saying none of these things are possible but just that these reports are technically in the rumour category at this time.