FWIW my M1 Air 2020 is at 93% health. We could speculate about the potential root cause of this different (I always use optimized charging and the author appear

FWIW my M1 Air 2020 is at 93% health. We could speculate about the potential root cause of this different (I always use optimized charging and the author appears to have it disabled on their screenshots)... but it's quite more likely that it's simply bad luck of the battery draw.