Right, but they do still permit the capacity to read accessible history, which is open to scraping and archiving. They can't completely kill the concept of doing that, realistically.

They can't stop someone from creating an archive that's inaccessible to them, if they don't know of its existense. Anyone can create an archive of something they can read and hide it, and selectively share it.

Such an agreement on curtails specific forms of automated crawling and public-facing archives.