I mean to be fair, most things Sakurai says are true...for a time. Not saying the man is a liar, he obviously is not. It is just that things change over time. Characters like Villager, Ridley, and the Miis all are characters that he considered at one point impossible. Mewtwo was the only planned DLC for 4. Now, does this mean that he is telling a lie for this being the last pass? Well, we can guess when that interview was done, there were likely no solid, concrete plans for FP2, leaving it up in the air. With how well Japan handled Covid and how much money Smash is making, who knows. All we gotta do is wait and see.
That being said, Crash is the single character I am the most confident in rn. I think Crash is very likely, the stars are lining up for him...