My Northern European country also has this kind of law which is 3 years, but it sounds better than it actually is, it covers only factory faults, and the burden of proof to show that the fault was present from factory is on the consumer after the 6 first month after purchase, so not many people get help thru that law.
I know a bit or two about that because I have tried several times to get help thru that law and I have never succeeded if an item has been older than 1 year, and in those cases were it succeeded it has been covered by the standard 1 year warranty instead.
Sometimes a company can do it thru goodwill, but I doubt Apple would do that?
I obviously don't know how it works in other countries though?
And if Apple considers the battery degradation normal for the time the AirPods has been used then I guess it will not be fixed for free? I have no clue how long these batteries should last under normal or heavy usage?
But its always worth a shot.