We now know that early cases were centered on the market, that both strains were present in the market, and that the types of wild animals that caused the original SARS outbreak in 2002 were being sold at the market.
Say a group of animals intended to be euthanized were actually clandestinely sold at the market, it's completely reasonable that the virus could have mutated at the lab in the animal population before being transmitted to humans. In fact, this is literally exactly what occurs during gain of function research, when scientists are explicitly trying to get a virus to mutate in live animals.
There is simply not any hard evidence to concretely prove either hypothesis. Any evidence that points to the market can just as easily be involved in a lab leak scenario.
When you have no comprehensive data on transmission, and no audit trail of how the animals arrived at the market, it's not possible to determine origin from super spreader. The evidence for both would look identical!
You're now just asserting, without any evidence, that the Wuhan Institute of Virology sent animals to the Huanan market. We already know that wild animals from the countryside are shipped into the market to be sold, and that this is exactly how the original SARS outbreak in 2002 happened. So why would you suggest that the animals came from a lab?