I have been covering Floyd Mayweather fights since 2009, Mayweather isn’t illiterate, is he Morgan Freeman, not at all, but he has basic reading skills. I can’t explain The Breakfast Club video because that was brutal, but I have seen Mayweather read things with my own eyes and never have too much trouble. Reading from a teleprompter or script, might seem easy, but it isn’t as easy as some make it appear to be.
As I’ve pointed out before 50 Cent while somewhat funny, really sounds like a bitter ex-girlfriend. On the flip side, Mayweather has used social media to out certain individuals, so he can’t be surprised when someone does it to him.
Whatever the case, just from my experience Mayweather can read just fine. Here is a video of Floyd doing some drops for CBS last year.