How did the Prophet, may God bless him and grant him peace, pray for the the Negus and ask the Companions to pray for him, even though he was not a Muslim? Or did he embrace Islam?

The article did not definitively deny the Islam of Negus. Instead, it cited the statement of some Companions, "Should we pray over a man who is not a Muslim?" Then, it mentioned that what was revealed indicated his being a Muslim, and Ibn Kathir's critique of this narration. The Islam of Negus and the confirmed fact that the Prophet, peace and blessings be upon him, performed the absentee prayer over him are established by authentic evidence. In Bukhari, it is narrated that the Prophet, peace and blessings be upon him, announced his death and prayed over him, saying: "A righteous man has died today, so stand up and pray over your brother As-hamah." Ibn Hajar definitively affirmed the Islam of Negus, and An-Nawawi mentioned that this hadith is proof for the legitimacy of praying over the absentee.