Utter nonsense. To paraphrase:

Any election system that favors unrepresentative candidates [like IRV] would be considered unreasonable; the same rationale must be applied to one that favors representative candidates.

Uh, no. That doesn't follow.

FairVote starts from the conclusion that IRV is the best voting method, and then works backwards to try to justify it, in this case arguing that a flaw of IRV is actually a feature, by making a false equivalent between a voting system that favors unrepresentative candidates and one that favors representative candidates.

The whole point of an election is to find the most-representative candidate.

Yes, candidates who are moderate relative to the voters should always win.

The goal of an election is to find the candidate who best represents the electorate. If the electorate is left-wing on average, the winner should be too. If the electorate is "strong on both personal freedoms and economic freedoms", then the winner should be too.

Anything else is undemocratic.

This isn't true. It's possible for a Condorcet candidate to be extremist relative to the other candidates or the electorate, since weak preferences are given equal weight to strong preferences. Simple example here:

This is true, but IRV doesn't choose the candidate who is most-liked (the "utilitarian winner"), either.

Under range/score, the best strategy to promote the election of a preferred candidate is always to give that candidate the maximum score and then give every other competitor the minimum score.

Yeah, this is false.

If you have perfect knowledge of how everyone else is voting (and you usually don't), then the best strategy is to give a maximum score to the frontrunner that you prefer, and also to everyone you like more than them, and to likewise give a minimum score to the other frontrunner, and to everyone you dislike more.

This is not bullet voting; it's equivalent to Approval Voting, and leads to more moderate winners who are good representatives of the electorate.

Real-world Score elections don't show this behavior, anyway, because polls are imprecise and the consequences of voting honestly under Score aren't as dire as they are under FPTP or IRV.

Rebuttal to [the original version of] this page at https://www.equal.vote/fv

This is nonsense. All voting systems are subject to tactical voting.