This comment is so interesting because clearly, it's the unvisited color that's broken, you know this, and you even typed it out, but it is so common for visited links to be darker than unvisited links that it makes you assume the opposite.
I'm hoping they mean the prerelease implementation was only creating leaks due to bugs that have been fixed, so a machine that runs the release implementation for the same amount of time wouldn't see such behavior.
This is also important for being able to show normal size text on smaller phones. I've got a 5.8" screen and basically every app is visually broken, with about 10% functionally broken as well. Every web or app designer should get an iPhone Mini or similar, crank the font size accessibility setting, and make sure everything works. In particular, any text that is truncated needs to have a line-wrapped version available somewhere, every page with content needs to be scrollable, and the input box needs to be functional (e.g. it must show at least one line) when the keyboard is out.
On web, use `overflow-wrap: break-word` and make sure your header can shrink.
The explainxkcd wiki says that cats were added later, and that permalinks go to a snapshot of the machine. So it's possible all the cats are lower in the machine, or the permalink is from before cats were added. There's some cats at the bottom of the machine right now. https://xkcd.com/2916/#xt=2&yt=105&v=1402