jpartain89 is a one-time poster who's been around since July of 2011, but is basically not part of the community.
I think that edit should be disregarded and it should be explained properly. It's obvious that this user doesn't understand how the Avoid Highway function is now working, or the edit is from before when it did pretty much what he said, and made routing impossible.
EDIT: In looking at the history of that Wiki page, that edit is from April 2012, and that's before the Avoid Highways started behaving properly. That whole part needs to be removed. It also appears that jpartain89 is completely unfamiliar with any of the terminology we use...he mixes Minor Highway and Major Road in one sentence. None of that paragraph makes any sense.