The Tesla Model 3 though was tested in 2019, and there were changes to the tests for 2020. The scores can't easily be compared between different years, although it's clear that the Model 3 would have performed very well under the 2020 tests too. The 2020 tests have, for the first time since EuroNCAP began in the '90s, ditched the deformable block for the offset frontal crash, and switched to a 'sled'. This better mimics hitting another vehicle, and is apparently in order to compare how a large car will damage a smaller one (EG if they're testing a Range Rover, how much damage it will do to a Fiesta).
It sounded to me that the award was for cars tested in 2020, anyway.