I WANT TO BELIEVE - Distillation cheaper than tap water

https://scitechdaily.com/mits-new-desalination-system-produces-freshwater-that-is-cheaper-than-tap-water/

According to this MIT paper, they've cracked sunlight-driven water distillation that uses no electricity yet provides 5 Liters of distilled, drinkable water per hour per meter squared!