Apple is known for its manic attention to detail but this huge mistake on its website seems to have gone under the radar. In the iPad 4th gen design section, it is listed as being 0.37mm thin (via Cult of Mac, Reddit). Hang on a second… That’s about the width of a piece of paper!
Who knows how long it’s been like that, but assuming its been that way since launch, boy did it take people a while to notice. This should be fixed soon though, even though it is still live as of writing.