TL;DR: RCV brought Minneapolis weak leadership partly because it failed in its promise to increase voter turnout and improve the tone of campaigns. Minneapolis has had 3 RCV mayoral elections, and it mentions NYC also, but the majority of the piece offers pretty standard lines about how city is run by a politically correct mob and has no direction.
I wish the RCV part provided more data to back up its role in the current situation, but the authors seem more upset that it elected a Democrat.