I think the disagreement is with this claim from the article (2nd to last paragraph):
Sci-Hub, more so than RG, therefore seems to have a greater potential for disrupting the current order of things and poses a significant threat to publishers and librarians, who cling to the mistaken belief that the key to Sci-Hub’s success is its alleged seamlessness (a single sign-on), which if they can replicate will go away.
The author is arguing that seamlessness is not Sci-Hub's only advantage versus traditional channels, but that "Much of the growth of Sci-Hub is therefore ideological", "publishers are seen as the enemy, whose greediness erects unnecessary barriers, thereby obstructing the advancement of science" and that "Sci-Hub is seen as a ‘Robin Hood’ figure"
Sci-Hub, more so than RG, therefore seems to have a greater potential for disrupting the current order of things and poses a significant threat to publishers and librarians, who cling to the mistaken belief that the key to Sci-Hub’s success is its alleged seamlessness (a single sign-on), which if they can replicate will go away.
The author is arguing that seamlessness is not Sci-Hub's only advantage versus traditional channels, but that "Much of the growth of Sci-Hub is therefore ideological", "publishers are seen as the enemy, whose greediness erects unnecessary barriers, thereby obstructing the advancement of science" and that "Sci-Hub is seen as a ‘Robin Hood’ figure"