I wonder if it's just looking at purchase records at the campus canteens, and if the circumvention would be for them to go to a canteen worker (one of them must be Muslim/sympathetic?) and buy fake meals throughtout the day, and redeem that for the evening fast-breaking feast. Welcome to the dystopian future, where you buy fake meals!
So yeah, China... "Use AliPay/WeChat, we promise we won't abuse your digital payment records!". Didn't MElon say he wants to make X.com a WeChat-esque super-app?