I would be really shocked if Shaykh Kalbani turned out to be the first "black" (whatever that means) Imam of Masjid Al-Haram ever. It is more believable that he is the first "black" Imam under the Saudis (since 1744) unless you go by the one drop rule. In any case, check out...
Mujahideen Ryder: The “Saudi Obama” – Shaykh Adil Kalbani, first Black Imam of Masjid al-Haram, Makkah
Mujahideen Ryder: The “Saudi Obama” – Shaykh Adil Kalbani, first Black Imam of Masjid al-Haram, Makkah