It's a reporting issue according to this article and has been fixed in MacOS 11.4 https://appleinsider.com/articles/21/06/04/apple-resolves-m1-mac-ssd-storage-l

It's a reporting issue according to this article and has been fixed in MacOS 11.4 https://appleinsider.com/articles/21/06/04/apple-resolves-m1-mac-ssd-storage-longevity-issue-in-macos-114-beta https://appleinsider.com/articles/21/06/04/apple-resolves-m1...