To dismiss the bio-weapon theory out-of-hand is to be blind to the reality of the CCP. They are horrendously evil, at least equal to the Soviet Union in their monstrosity. They’re amoral and quite capable of anything. Human life is meaningless to them, so, unless you have inside knowledge of CCP policy, I’d be less quick to exonerate them.
Regarding the specific, Epoch Times video, presumably you’re voicing the concern that they’re funded by an anti-CCP group. While that’s certainly true, that doesn’t automatically mean the journalism in question is therefore biased and/or inaccurate. I suggest looking at the documentary and deciding for yourself. In my opinion, it’s both professional and well-researched.