By the way, I caught those errors just briefly skimming, so I’m sure there are several others.

But make no mistake, I agree that score voting is the best voting method for public single-winner elections.

If the theorem only applies to a 3 candidate election, can you give an example of an election with greater than 3 candidates in which voters can gain an advantage by not voting their true preferences?

Range voting encourages honest voting, rather than strategic voting. There is never an incentive for you to score a candidate you support more lower than a candidate you support less.

The theorem is actually as follows: Honesty Theorem. In a 3-candidate range election, nobody can ever gain strategic advantage by dishonestly range-voting as though Alice>Bob, if their honest opinion is Bob>Alice.
ScoreVoting.net

You also didn’t mention explain rule D.