1- Add a page or DNS record proving that you own the domain
2- Email receipts showing that you owned the domain for the requested range
3- Wait 24 hours
For my domain, it was also enough to email them from the email address listed on my site's contact page without any DNS changes.
https://ico.org.uk/for-organisations/guide-to-data-protectio...
> When does the right to erasure not apply?
> The right to erasure does not apply if processing is necessary for one of the following reasons:
> …
> for archiving purposes in the public interest, scientific research, historical research or statistical purposes where erasure is likely to render impossible or seriously impair the achievement of that processing
So Internet Archive is prob covered under archiving in the public interest. But don’t IA remove pages upon request?
https://help.archive.org/help/how-do-i-request-to-remove-som...