How was it debunked? Chinese have claimed these are just prisoners being transfered. The reality is that china is a secretive state.

This person has found the video location: https://twitter.com/Nrg8000/status/1175353408749891584

When making a claim like that, consider supplying a source. You could look it up, and tell us exactly what you've got in mind. Or you could make every one of us look it up, and even if we found something, we'd wonder if it was the same thing that you found convincing.

You not only stated an unsupported claim, you were also willing to waste many peoples' time to avoid wasting your own.