It may help to spell this out. Perhaps here is something else that needs another term in the glossary. The section on Fixity entangles the concepts of error handling, and authenticity. I propose scrapping any mention of errors. The faithful preservation of the byte-stream is the job of the archival storage.
Authenticity is a different matter, and perhaps invites the use of digital signatures.
If we had been more definite about the need for a name-space, the first paragraph could be much crisper. It is obsolecence of disk and tape drives that is the prime motivator. It deserves a mention.