Earlier quoted context omitted.
Would you please click the link and read about the Fair Voting Act in its entirety? I believe it addresses every issue you have raised so far.
I'm confused. I haven't actually brought up any issues except those raised in the link I provided, where IRV has some serious issues. So allow me to remedy it by providing specifics. Your link clearly says, in heading: "RCV for Single-Winner Offices (also known as Instant Runoff Voting / IRV)". So unless they are not actually using IRV, then the link I supplied is relevant. It's specifically this part which is broken…
There is a lot more to the Fair Representation Act than just RCV. Lots and lots of detail on the site, including some mathematics on multi winner elections.