That is because they say: The Fire will not touch us save for a certain number of days. That which they used to invent hath deceived them regarding their religion.
Times are computed by method; your mosque's timetable governs the adhan. Every text carries its source and grade. Nothing here is a fatwa, a prediction, or a substitute for a doctor: your own scholar decides what is contested, and the tradition itself says the practice is alongside treatment, never instead of it.