Therefore, its known narrative elements are not a part of the Doctor Who universe as we, on this Wiki, choose to define it. It may have been the basis for a similar story in another medium, however — and that story may indeed be valid.
World War was a planned Doctor Who stage play by Ben Aaronovitch and Andrew Cartmel. During its writing, the monsters named "the Metatraxi" were created. It was eventually replaced by Terrance Dicks' The Ultimate Adventure. (DOC: The Lost Season, DWMSE 10)