I don't see any reason either. What exactly is disputed? I see the tag says,  I don't understand why this tag is even necessary. Firstly, The article contains quotes mostly from Canonical hadiths, eminent muslim scholars. Secondly, Rahman al-Mubarakpuri is a reputed Islamic author and arabic version of "The sealed nectar" that has been quoted has received the first prize from the Muslim World League, at the first Islamic Conference on Seerah, following an open competition for a book on the life of Muhammad in 1979 (1399 AH). The publisher's note says here   (Why don't we talk?)