this is how the Shaykh explained it: Firstly: gathering to recite and study the Qur’aan, whereby one of them recites and the others listen, and they study it together and explain the meanings, is something that is prescribed in Islam and is an act of worship that Allaah loves and for which He rewards greatly. It was narrated by Muslim in his Saheeh and by Abu Dawood from Abu Hurayrah (may Allaah be pleased with him) that the Prophet (peace and blessings of Allaah be upon him) said: “No people gather in one of the houses of Allaah, reciting the Book of Allaah and studying it together, but tranquillity descends upon them and mercy encompasses them, and the angels surround them, and Allaah mentions them to those who are with Him.”
Even if we take your explanation, how does this fit with mehfil-e-quran which are meant for asala-e-swab or sometime people are given parts of the Qur'aan to recite and it is considered that they have complete reciting the whole Qur'aan?
Shaikhs explanation goes beyond what is in the hadees, He is putting words in tbe mouth of Rasool Allah(SAW).
It is said in Quran that do not go ahead/boyond Allah and his Rasool(SAW).
He is going ahead of Rasool Allah(SAW) who did not prohibit what shaikh is trying to prohibit.
Now the part where every body is given a juz and it is considered that whole Quran has been completed , where is the flaw in that thinking ? Everybody reads one juz and they finish the whole Quran. Nobody thinks that each individual finished the whole Quran individualy.