The linked blog post is making the limited claim the posts on archive.org accurately represent the posts present on Reid's site at the time they were archived, and do not appear to have been altered post-archiving.
This might actually be a good use case for a blockchain. Hashing the data that's added to the archive and then putting the hash in the blockchain would reasonably prove the data in the archive hasn't been modified at a later date.
This might actually be a good use case for a blockchain. Hashing the data that's added to the archive and then putting the hash in the blockchain would reasonably prove the data in the archive hasn't been modified at a later date.