It's not that it's not indexed, just not the top result. Maybe it dropped as a regular result because of confusion about whether "web.archive.org" is the same/similar to www.archive.org
who knows
There's definitely variations on it too, appearing as a subpage of Internet Archive listings..... appearing as it's own thing with direct search field underneath etc. It's all variations. (Not arguing that it shouldn't be a result for "wayback machine" search, but that's a quality issue)
