You provided a source showing that a chicken virus escaped selective pressure, in chickens, grown in a lab. Let's not overstate the relevance of your "evidence"

You provided a source showing that a chicken virus escaped selective pressure, in chickens, grown in a lab. Let's not overstate the relevance of your "evidence" to SARS-CoV2 amongst the human population. But as I said, there's nothing terribly surprising about the idea that pathogens mutate to escape selective pressure. It's right out of biology 101. It would be tremendously surprising if those pathogens became more virulent, which is what you're trying to claim.