وَلَيْسَ عَلَيْهِ أَنْ يُفَارِقَ امْرَأَتَهُ إِذَا حَجَّ بِهَا فِي الْقَضَاءِ
Translation: He is not required to separate from his wife if he performs the make-up Hajj with her.
Yufariqa imraʾatahu concerns whether the spouses must separate from one another while undertaking the make-up Hajj. Al-Quduri says separation is not obligatory.
This is not permission for intercourse while in ihram: no mandatory separation and continued observance of ihram restrictions are distinct matters.