There are independent agencies that will certify destruction of data. For example FTI Tech, Kroll, Epiq, HaystackID and others.
No such certificates have been presented.
Nothing less is trustworthy.
what kind of sorcery do they have to let them determine that no backups were taken before they arrived to "certify"?
Customer data could live on the computer Elon pretends to play Diablo 4 on for all we know.
So I don't think it can ever work without exhilarating the data - rather I am still surprised people don't understand the implications.
I have news for you. There are standards around data destruction [1]. Courts also order data deletion, to be carried out by forensic experts [2], who trace data in computer systems, and delete what is required, and certify accordingly. This can be done even in cloud-scale compute [3][4][5] - corporate systems especially have routine extensive logging and traceability that allows for this to be accomplished. The companies that I listed earlier specialize in this compliance capability.
[1] https://en.wikipedia.org/wiki/Data_erasure#Standards
[2] https://www.govinfo.gov/content/pkg/USCOURTS-ohnd-5_17-cv-02...
[3] https://www.ftc.gov/system/files/ftc_gov/pdf/paravision_comp...
[4] https://www.ftc.gov/system/files/ftc_gov/pdf/Amazon-Proposed...
[5] https://www.ftc.gov/system/files/ftc_gov/pdf/Edmodo-Dkt15%28...