Undetected? The lab was specifically searching for and storing pandemic-capable viruses, and had applied for grant money to insert furin cleavage sites into them!
Nope. It was looking for bat viruses. There is no way to tell if such a virus is even able to infect Humans, without testing it out on Humans.
The grant application is not proof that they either performed such experiments at all, that they did it on that particular virus nor that it worked. And there's still a long distance between a random bat virus with a "furin cleavage site" and something that is good at infecting Humans. All this theory is so far is wild speculation.
Undetected? The lab was specifically searching for and storing pandemic-capable viruses, and had applied for grant money to insert furin cleavage sites into them!