[duskwuff]

I'm pretty certain that this isn't the case. If anything, it's the other way around - if a domain changes hands, and the new owner sets up a restrictive robots.txt, the content in the archive is made unavailable, and stays unavailable even if the robots.txt (or the whole domain) later disappears.

[antitrust]

This has been my experience as well. Once the content is deleted, it's gone.

[rwmj]

This is not true.