It would be better to be consistent with the home page and make clear that GuixSD is a GNU distribution, with Linux-libre being the default kernel for the foreseeable future.
Background: Wikipedia has a policy to call GNU/Linux distributions "Linux distribution" because that wrong term is more commonly used by the public. To define GuixSD as a "GNU/Linux distribution" gives them in turn justification to define it as a "Linux distribution" instead. Taylan