Black people under Christian rule vs Black people under Muslim rule

[STAMPEDE]

Prophet Muhammad ﷺ last sermon: "All mankind is from Adam and Eve, an Arab has no superiority over a non-Arab nor a non-Arab has any superiority over an Arab; also a White has no superiority over a Black nor a Black has any superiority over a White except by piety and good action. Learn that every Muslim is a brother to every Muslim and that the Muslims constitute one brotherhood. Nothing shall be legitimate to a Muslim which belongs to a fellow Muslim unless it was given freely and willingly."

 

[Primalsplit]

Didn't Muslims chop off sub-saharans dicks and used them as slaves?