But how is this related to the internet being archivable? This sort of proves the point that URLs were always a terrible idea to reference in your compliance docs, the answer was always to get the actual docs.
Wayback machine URLs are much more likely to be stable.
Even if the content is taken down, changed or moved, a copy is likely to still be available in the Wayback Machine.
IME compliance tools will take a doc and or a link. What's acceptable is up to the auditor. IMO both a link and doc are best.
Links alone can be tempting as you've to reference the same docs or policies over and over for various controls.