I know because, well, Lennart said this. As well as a Mageia packager. Oh, and a Debian packager. Oh, an Ubuntu packager said the same. Oh, an openSUSE packager as well. Damn those (in your words) idiots for doing what you say is not possible!
Btw, Lennart also said more in that eudev "presentation" during FOSDEM. Would be nice if you would watch that and at least try to learn something. Various inaccuracies like this made by Gentoo "developers" were addressed/educated. :P