News M1 MacBook SSDs are facing a big problem — and it could kill your laptop

Feb 26, 2021
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"Equally, the problem could be with the reported number. This could be caused by a bug somewhere within macOS Big Sur which is miscalculating the SSD usage."

SMART data does not come from OS, it comes straight from mass storage's controller. OS can't (or at least shouldn't) fake those numbers.
That's the whole point of SMART: The users and manufacturers of mass storage can verify the health of their storage.