Yeah wait, what? I hope that's incorrect. Updating robots.txt to disallow should only omit content from that point onward... It shouldn't be retroactive. What if there's a new owner of a respective domain, for example?
It isn't, I really wish that instead of wiping DECADES of history; it only applies to content that was archived from the day of the domain's registration. I think this is slightly more reasonable, but I imagine they simply don't have access to such data.
https://blog.archive.org/2017/04/17/robots-txt-meant-for-sea...