Actually, I never thought of dust to be a pulverized ground that was destroyed bits at a time. I only thought dust like fine particles. Maybe the Japanese developers were thinking of a term to use to describe the hill in its broken status. So maybe they thought to "turn something into dust" (e.g. pulverization) would be a great description to give the condition of the hill in the bad present. So yeah, not "dust" like particles, but "dust" like the act of pulverization. Sure, it could be a stretch. I'll also never forget that time it was discovered that Sonic Crackers was actually supposed to be Sonic Clackers. And that the "L" and "R" sounds the same in Japanese speech.