The above hadith is narrated through another chain.
Sahih Muslim Book 17, Hadith 3
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"What becomes unlawful through breastfeeding is that which becomes unlawful through birth."
Sahih Muslim Book 17, Hadith 2 Next Hadith → 'A'isha (Allah be pleased with her) reported that Aflah, the brother of Abu'l-Qu'ais, who was her uncle by reason of fosterage, came, and asked her permission (to enter the house) after seclusion (Hijab) was instituted. I refused to admit him. When Allah's Messenger (ﷺ) came, I informed him what I had done. He commanded me to grant him permission (as the brother of her foster-father was also her uncle).
Sahih Muslim Book 17, Hadith 4
Sahih Muslim Book 17, Hadith 2 Next Hadith → 'A'isha (Allah be pleased with her) reported that Aflah, the brother of Abu'l-Qu'ais, who was her uncle by reason of fosterage, came, and asked her permission (to enter the house) after seclusion (Hijab) was instituted. I refused to admit him. When Allah's Messenger (ﷺ) came, I informed him what I had done. He commanded me to grant him permission (as the brother of her foster-father was also her uncle).
Sahih Muslim Book 17, Hadith 4