All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
What that Shaykh mentioned that women constitute most of the dwellers of Paradise and inhabitants of Hellfire is what the noble companion, Abu Hurayrah understood from the authentic narration of the Prophet that the first and second group of men who enter Paradise will have two wives entering with each man, and that in Paradise there is no man without a wife.
An-Nawawi said that what is understood from this narration reported by Abu Hurayrah is that there are too many women in Paradise, and the narration which states that most of the dwellers of Hellfire are women, means that women constitute the majority of humankind.
As regards specifying exactly how many they are, like being two-thirds, or more or less, then we have not come across anything which states this and the narration does not specify it.
Allaah Knows best.