Exactly. A few paragraphs in I started skimming for some mention of what they replaced trays with. There was nothing. When I went to university there were plastic plates, which amounts to the same thing as trays in regard to the cleaning that the article talks about. Are they using paper dishes? Having students supply their own?
No no. The idea is that before, you had plates and bowls sitting on top of a tray. All had to be washed and disinfected. Now you don't have the tray, the students carry their plates in their hand directly. No tray to wash.