The researcher makes an excellent point that he virus still hasn't been found in the environment. If there's no natural reserve for the virus, then it's logical that it was created. If so, what does the rest of the world do with China?
There are very very similar viruses in a region approx 500km from Wuhan in China.
Job announcements in the local lab late last year referred to "interesting" and dangerous viruses having been collected in that region and needed help working on them.
At this point I am quite confident it was not created in a lab but simply escaped from a lab likely due to the famous Chinese incompetence.
The Principal investigator is said to have died from that virus.
She was likely patient Zero
Chinese Govt denies it, but cant produce her alive.
That lab is 250 meters (=275 yards) away from the wet market thats been ID'ed as the "source".
I can see easily a semi-literate and dirt poor, lab cleaner taking research animals that were supposed to be destroyed and selling them at that market instead.
So starting the global epidemic.