Moffet's comments are from a 9-page biographical sketch introducing some of Rydberg's poems in her book, The North! To the North!  Her observations regarding Rydberg's sexuality are very plausibly interwoven with her account of his childhood, marital issues, and writing.  She concludes that "Sven Stolpe and Victor Svanberg were certainly correct that Rydberg was a homosexual" (p.80), but while she cites to their work, she does not simply repeat their views.  It is noteworthy that no Rydberg biographer, or any other scholar, has ever disputed the accuracy of Moffett's, Svanberg's, or Stolpe's conclusions regarding Rydberg's sexuality.