Specifically, he stated that enough sequels were under consideration to bring the franchise to a full 10 films, but that the eighth film was a guarantee even if Furious 7 bombed.
Not only did Furious 7 not bomb, it went on to become one of the highest-grossing films of all time.
His comments appear to be referencing a 2013 interview with Collider in which Paul Walker said an eighth film in the franchise was “guaranteed” more than a year before Furious 7 was even released.
Apparently, when your friend who passed away says you’re going to make part eight, you just have to make part eight.