You probably want archive.org: https://web.archive.org/web/2/https://ken.arneson.name/2015/....

IIRC, archive.is actually explicitly rejects the idea that they're an actual archive for the preservation of material.

So is archive.org. They take down articles when journalists ask them too and block legal sites from being archived. It is more likely for archive.org to take down or make inaccessible a piece of content than archive.is.