The latter is simpler—it is reasonable to think a lab that maintains and studies viruses similar to Covid-19 accidentally allowed one to be released. It does not imply an intent to misuse the virus.
I have not watched the video, I’m sorry. I’ll try and get to it later.
It doesn't imply intent to use as a bioweapon, much less release it in their own population.
The hypothesis that this was a gain-of-function experiment that went awry due to lax security still does put a lot of pressure on Chinese authorities, on top of the poor handling at the beginning of the outbreak.