Why was it important for Imam Bukari to include strength of prophet pbuh?

Anas bin Malik said, “The Prophet used to visit all his wives in a round, during the day and night and they were eleven in number.” I asked Anas, “Had the Prophet the strength for it?” Anas replied, “We used to say that the Prophet was given the strength of thirty (men).” And Sa`id said on the authority of Qatada... แสดงเพิ่มเติม Anas bin Malik said, “The Prophet used to visit all his wives in a round, during the day and night and they were eleven in number.” I asked Anas, “Had the Prophet the strength for it?” Anas replied, “We used to say that the Prophet was given the strength of thirty (men).” And Sa`id said on the authority of Qatada that Anas had told him about nine wives only (not eleven).

Sahih al-Bukhari 268

Vol. 1, Book 5, Hadith 268

Or clothes that were stained with janaba spots?

Was Imam bukari kafir? Why didn’t he edit out stupid stuff? That doesn’t make sense? I mean it sounds stupid nowadays probably were back then too.
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