I skimmed the study you linked. It has a focus on the social aspects of renewable energy, namely would the population react with acceptance or resistance (or varying degrees thereof ) and is divided into the corresponding scenarios which influence the outcome. That said, the summary clearly states that it is both technically feasible and more cost efficient if suffiency with renewable is realized if you can build on wide social acceptance.

I think this paints your statements in a different light. You omitted the studies focus on social aspects.