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My experience of checksums are in things like serial where they can potentially recover a corrupt bit.
I presume in the case of encryption, a checksum is more of a hash of the raw data? Like a one-way deterministic compute. Easy to get a hash of data, extremely difficult to get data from a hash.
In which case, it’s fine. Passwords are hashed (granted, multiple times), but a cryptographically secure hash is not to be underestimated.
I feel like “look at twitter” is probably enough of a defence to decline president musk.
It would probably need to be wordier for court proceedings.