I suspect Gary Johnson getting chosen by a Borda count isn't as weird/surprising as the number of question marks implies. Caveat: I didn't see a raw distribution of preference orders on the Vox survey; if it's linked somewhere, I missed it. But I think Johnson is effectively acting as a compromise candidate: a lot of Clinton voters
really hate Trump and a lot of Trump voters
really hate Clinton, enough that they'd both prefer Johnson over the other candidate, even if they don't actually know much about him, or even mildly dislike him. Borda count tends to choose compromise candidates, so that's what you end up with. Now, Johnson's policies are fairly fringe and weird, and so are the other third party candidate's (Stein), but that's because serious candidates don't run on third party tickets that have no chance of winning. If the election was actually conducted using a Borda count, you'd probably see a number of relatively boring centrists running, and one of them would win instead of Johnson - which is a perfectly reasonable result. Well, except that that would also fundamentally change the coverage of the race, so there's no reason to expect the election would go anywhere near the same way overall (it would probably be less polarized), but the point is that to the limited extent the survey results reflect this hypothetical world, they don't cast it in a bad light.
Edit: Also, I like Clinton, but her being the Concordet winner doesn't mean much in terms of that world either. When almost all of the ballots give the top rank to one of two candidates, whichever of the two gets more votes is the Concordet winner. But that's only the case because of first-past-the-post, both because there aren't any good third-party candidates (neither centrist nor extremist), and because the structure of the race strongly encourages voters to sign up for one bandwagon or the other .