Yo, I had chills watching that video. I wonder what went through Odas' head writing something like that down on paper. Was it a little bit of fear ? Hearing and seeing the news of Japanese workers' sudden deaths, like voice actors passing away or other mangakas ?
(God forbid, I know Oda is probably in the best medical care.)
Was he afraid that in a worst-case scenario people wouldn't believe that he told the end to a few selected people, and it would always feel weird because some would just accuse them of making up stuff on their own ? So writing it down would be like double proof.
Here is the thing, if this is the real deal, then all the rumors that Oda would change what the one piece was if a fan predicted it right would finally come to an end.
Because now that it's written down, this is it, he cannot change it anymore.
I hope everyone who is reading the story gets to see the End eventually.