First release: In this Hanafi sequence, stoning followed by shaving or shortening lifts most ihram restrictions, but marital intimacy remains prohibited.
Second release: After the obligatory Tawaf al-Ziyarah, that remaining prohibition ends. The visitation tawaf is an obligatory pillar of Hajj, not something made dispensable by stoning and shaving.
Keeping the two stages distinct prevents the mistaken inference that Hajj is fully completed as soon as the Jamarah is stoned.