It's straight up not canon. Sorry about your headcanon but it isn't. It doesn't even fit in the timeline lmao
I guess Sanji's flashbacks in Whole Cake Island aren't canon since they don't fit in the timeline either. He remembers the crew in the NW, but Sanji and the crew hadn't spend all those times together :/. Gonna tell Oda that the manga isn't canon either.
Also, in the manga Zoro put on his bandana in one chapter but it was off in the other chapter. Guess I'm gonna have the delete one of the chapters as non-canon. :/.
Also in the manga Zoro broke Kamazous scythe clean in half. But it's whole in the next chapter. Rengoku Onigiri is now now-canon since apparently small insosnsteincies in time line = non-canon.