The invalidity of the claim that the number seven indicates multiplicity

Some of the proponents of the methodology of scientific miracles in the Qur'an say: that the number seven has a meaning other than seven, but rather it indicates multiplicity.For example: A man says in the language of the Arabs: "May Allah multiply your reward," meaning: May Allah increase your reward. What is the validity of this statement?
This is not correct. The numbers mentioned are three, five, and seven, and there is nothing in them [implying multiplicity].

The questioner: They say: The number seven, if there is no indication that it is seven units, as it came in Hajj: [al-Baqarah: 196] This is a circumstance indicating that this number here is seven units, but as for seven heavens or others, they say from the numbers: that they are from scientific miracles or something like that.

The Shaykh: Never; this is one of their errors;Because Allah said: [al-Baqarah: 196] so that the one who thinks does not think that when they are separated, each one is not connected to the other, because he fasts three days in Rajab and three days in Rabi' for example, separated,Here he says: three in Hajj and seven when you return, perhaps he does not return to his country until after a month or two months,So he said: [al-Baqarah: 196] so that the one who thinks does not think that when they are separated, some of them are not joined to others.
Glory be to You, O Allah, our Lord, and praise be to You. We testify that there is no deity but You. We seek Your forgiveness and turn to You in repentance.