As per this new ideology, Hajj can be performed in 4 months instead of concluding the Hajj on the scheduled days of Dhul-Hijja. See below Q&A describing their ideology-
Q11: How many months are sacred and are they scattered or adjoined as per Kitabullah?
A: They’re 4 and they’re consequtive in succession and this is so serious that Allah swt calls them the upright religion.
Please see Ayahs: 9:36, 9:2, 9:5, 2:197