That seems genuine from Ali. They did make history and a lot of money.
Joe helped Ali out when he was banned from boxing and Frasier gave Ali his hardest fights.
Joe probably did hate Ali, which you can not blame him but Ali knows that Joe played a huge part of his career.
I heard that Joe Frazier told somebody right before he died that he would never forgive Muhammad Ali 100%. I think Muhammad Ali went too far with the ugly gorilla jokes and it really hurt Joe Frazier