IIRC the IA no longer cares about robots.txt after it kept getting abused [1] to take down older pages. You can still request to take down pages, but it needs a form and a reason. [2]
(Remember, robots.txt is not a privacy measure, it's supposed to be something that prevents crawlers from getting stuck in tar pits!)
[1] https://blog.archive.org/2017/04/17/robots-txt-meant-for-sea...
[2] https://help.archive.org/help/how-do-i-request-to-remove-som...