An interesting topic for Tim Cook to tweet about. Perhaps he’s trying to emphasize their use of non-Chinese companies in their manufacturing process?
Having worked with Apple in Japan directly (not just engineering related work, but having worked with former Apple Japan execs), I can tell you that the relationships they hold with companies over there are valued internally. It's part of the culture, for better or for worse.
I can't state for certain whether it matters in the context of Cook's Tweet, but it wouldn't surprise me in the slightest either. Don't be so quick to cast it aside. ;P
Mark Carney yesterday almost intimated companies to get out of fossil fuels. Thurnberg’s books are everywhere. The switch to eco-friendly modes of production and consumption is likely to be the big issue of the next decade.