The testing assumed only one infected person on the plane and did not simulate the effects of passenger movement around the cabin.
... and we've all seen clips of the complete idiots who "know better" / "won't wear a mask" / "won't do as they are asked" and, thus, put the rest of us at risk.
I find the report encouraging in some ways - but, until there is sufficient compliance with the new rules, I'm still not getting on any public transport (aircraft included).
Just my POV.