Don't take this to mean I support china or think everything is roses over there, but that channel is simply propaganda. Genorously 40% of it is valid criticism, but if someone in china stubs a toe they will make a 30 minute video about the unsafe furniture epidemic.
I don’t watch that channel but have seen a couple of videos from laowhy86 before he left China, so would be curious to know what is not true on their channel.
I'm unsure how he claims to have found the source. The theory begain at the beginning of Jan 2020 but he posted in April 2020.
Just watching the 'thorough' analysis video, he talks about some person who posted a paper about the source, and in the screenshot it shows Feb 2020. And says the source of the paper was from laowhy86's video, which is published April 2020.
I stopped watching there because it already makes no sense.
At timestamp 6:36 of his video [1], laowhy86 analyzes a copy of the draft "The possible origins of 2019-nCoV coronavirus" to conclude that the virus must have come from the lab. This preprint has been shown to be false by future scholarship (see the citations of the draft at [2] for some examples).
Potholer then analyzes the veracity of the claims within that preprint in his video [3], starting with an excerpt of [1] starting at 2:02.