This is not true. RCV elects a candidate preferred by a majority of voters, regardless of whether that majority prefers a Democrat, Republican, independent, or minor party candidate.

RCV is a mechanism for running an election, and in itself, doesn’t promise to assist any single party or candidate. The question of who benefits most from RCV is ultimately up to the voters to decide on election day. What RCV does guarantee is that whomever emerges as the winner of a contest does so with a true majority mandate backing them, so that they can honestly represent the most constituents. We believe that any party or candidate should satisfy this basic principle of democracy. 

RCV gives each voter the freedom to vote for their true first choice without fear that such a vote will help the candidate they like least.  It eliminates the "spoiler" effect of our current system where a conservative district, for example, can be represented by a liberal because two conservative candidates split the conservative vote.