Not even remotely true:

On March 28, a District of Columbia Superior Court dismissed a lawsuit filed by the Democratic Party to stop an initiative from qualifying.  The initiative hasn’t even gathered the signatures yet, yet the Democratic Party had been hoping to block it.  The judge said the lawsuit isn’t ripe, and could be filed again if the initiative qualifies and passes.  The initiative also would change the law to let independent voters vote in partisan primaries, but it is not an initiative that abolishes the ability of parties to have nominees.

So tired of this myth

It wasn't just Republicans who opposed the system. Democrats were in power in some cases and also opposed it. That's why we got ranked-choice, it was done through a ballot initiative because neither party wanted to implement it or to pass a law that would implement it.