Likely, they will never be convincing of anything ever. Much like 'Global 'Warming' the data has all been politicized. It is now all about lying with statistics.

The sides are already drawn in the sand. The maskers are just going to say 'this is evidence of why masks and lockdowns worked.' The anti-maskers are going to say 'look it's no worse than the flu.'

Best case scenario at this point is that we save some unmanipulated data from obscure non-western countries that don't have any skin in the game in the politics of the western world.

https://www.sciencemag.org/news/2020/08/pandemic-appears-have-spared-africa-so-far-scientists-are-struggling-explain-why