All the existing, currently approved vaccines weren't tested in the current real world in this way - their clinical trials were done in an environment that most

All the existing, currently approved vaccines weren't tested in the current real world in this way - their clinical trials were done in an environment that mostly predated the modern variants, which is where the numbers for them in the article come from. We know they're less effective against the variants but don't know how well they'd do in a present-day clinical trial like this one.