The source recommends one completion of the Quran in Tarawih during the month.
But it gives an important qualification:
• if the congregation becomes weary, the chosen view is to recite an amount that does not drive people away.
So the goal of Khatm does not justify making the prayer so burdensome that the congregation is alienated. This corrects the earlier wording that suggested Khatm should normally be maintained despite people's fatigue.