What is the ruling on abstaining from food and drink according to the Umm al-Qura calendar?

The questioner : The second question. The second question. A continuation of the previous question: Does a person abstain from food and drink according to the calendar, O Shaykh? The Umm al-Qura calendar.

The Shaykh : The Umm al-Qura calendar anticipates the dawn by five minutes. So, if a person eats two or three minutes after the time indicated in the calendar, there is no harm. And he does not pray the Fajr prayer until five minutes or more have passed after the time indicated in the calendar.

The presenter : May Allah reward you, and thank you.

The Shaykh : Because we have entrusted the matter to one of the brothers who is knowledgeable about these things. So he calculated a time that is five minutes between it and the Umm al-Qura calendar.
Some people have claimed that there is a quarter of an hour or more between the calendar time and the appearance of dawn, but this seems to be an exaggeration, and Allah knows best. However, there is no problem with five minutes. The scholars (may Allah have mercy on them) said that if a person asked two men about the appearance of dawn, and one said that dawn had appeared and the other said that it had not, the second opinion is adopted. This is because the default is the continuation of the night. Since the two reports conflict, the one that agrees with the default is adopted because it is stronger.
This is the same issue mentioned by the jurists (may Allah have mercy on them). We have two people knowledgeable about the calendar, one says this, and the other says