You are reading a tafsir for the group of verses 61:7 to 61:9
ومن اظلم ممن افترى على الله الكذب وهو يدعى الى الاسلام والله لا يهدي القوم الظالمين ٧ يريدون ليطفيوا نور الله بافواههم والله متم نوره ولو كره الكافرون ٨ هو الذي ارسل رسوله بالهدى ودين الحق ليظهره على الدين كله ولو كره المشركون ٩
وَمَنْ أَظْلَمُ مِمَّنِ ٱفْتَرَىٰ عَلَى ٱللَّهِ ٱلْكَذِبَ وَهُوَ يُدْعَىٰٓ إِلَى ٱلْإِسْلَـٰمِ ۚ وَٱللَّهُ لَا يَهْدِى ٱلْقَوْمَ ٱلظَّـٰلِمِينَ ٧ يُرِيدُونَ لِيُطْفِـُٔوا۟ نُورَ ٱللَّهِ بِأَفْوَٰهِهِمْ وَٱللَّهُ مُتِمُّ نُورِهِۦ وَلَوْ كَرِهَ ٱلْكَـٰفِرُونَ ٨ هُوَ ٱلَّذِىٓ أَرْسَلَ رَسُولَهُۥ بِٱلْهُدَىٰ وَدِينِ ٱلْحَقِّ لِيُظْهِرَهُۥ عَلَى ٱلدِّينِ كُلِّهِۦ وَلَوْ كَرِهَ ٱلْمُشْرِكُونَ ٩
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3

In this verse ‘He may cause it to prevail over all religions’ means that in terms of intellectual supremacy, all non-monotheistic beliefs about God and religion in the world were to be demolished and monotheistic belief was to be promoted as the predominant belief. All other beliefs were to be intellectually overcome. This was a forecast made in the Quran under the most unfavourable conditions in the year 3 Hijrah. But it later turned out to be literally true.