I think you're misunderstanding this, but granted the wording was confusing. This isn't talking about skipping Farmington or Gallup. Getting to Holbrook is no problem, and you can use whichever Superchargers you need. It's the last leg that is questionable, that he's talking about, since he says "The distance is 255 miles". It's only that last segment between Holbrook and Tucson that is 255 miles, and there is not a Supercharger directly on that route.
So, for recommendations:
I put in Holbrook to Tucson in Google Map routing to see what options and drive times it shows. That direct south route on highway 77 shows 235 miles, 4 hours 28 min. The alternative route along highways 260/87 toward Phoenix and then back along I-10 to Tucson shows as 285 miles, but 4 hours 34 minutes. So it's a longer distance, but makes up for it with a solid segment of high speed limit on the interstate, so they are almost the same drive time. And then if you take that longer route, it goes by Payson Supercharger and Casa Grande Supercharger, so you could just pull off at either one of those for a quick 15 minute break, and make it with no issues at all. Given that it's winter, that is probably what I would do.