Earlier quoted context omitted.
The proposal that this article is about weakens your argument significantly. They were going to experiment with multiple backbones, experimenting with multiple variations of spikes, looking specifically to try novel types of furin cleavage sites. There was no public reporting of what happened with this research. We don't know what they have because WIV database was taken offline. They claimed to have searched it, but…
But at the end of the day you have zero evidence of any of that actually happened. The backbone doesn't exist, the spike doesn't exist, the effort necessary to culture that completely unknown virus in the lab isn't documented anywhere. And the grant proposal very specifically is concerned with using the WIV1 and SHC014 backbones, nothing related to SARS-CoV-2. And going from sequence to live culturable virus that you…
But that doesn't invalidate the animal transfer hypothesis. Because that isn't how science works -- or even just how KNOWLEDGE works. No one[1] operates under perfect certainty; we collect stronger or weaker evidence for various possibilities.
This grant application doesn't "prove" that SARS-CoV-2 was leaked from a lab. But nothing "proves" it wasn't. The existence of this grant application is evidence supporting the lab leak hypothesis, demonstrating conclusively that someone in the world was thinking, prior to the pandemic, about performing modifications to coronaviruses similar to what we have observed in the virus.
[1] Except mathematicians: https://xkcd.com/263/