How has it been debunked ? I didn’t realize that.
Here’s one take, but it has been torn to shreds from multiple angles:
https://townhall.com/tipsheet/scottmorefield/2021/09/07/dr-scott-atlas-others-throttle-bangladesh-mask-study-extremely-weak-tea-n2595498
If you can breathe through a mask, the Covid virus can pass through the mask.