At least for the Pfizer study, no Covid-19–associated deaths were observed in the study or control groups so this says more about COVID and the study than about the vaccine itself.
They were able to assess the efficacy by looking for illness, not death. It takes some verrrry "special" framing to twist this into anything but an enormous success:
> BNT162b2 was 95% effective in preventing Covid-19 (95% credible interval, 90.3 to 97.6).
Yet the deaths clearly mattered when multiplied up to population scale, because COVID was able to fill up the hospitals.
> BNT162b2 was 95% effective in preventing Covid-19 (95% credible interval, 90.3 to 97.6).
Yet the deaths clearly mattered when multiplied up to population scale, because COVID was able to fill up the hospitals.