Basically. The only people who say it's not canon are those who just dislike the idea of the continuation, or they are just salty about the details of such said story.
There was a information box about the flash forward which OD translated
Note: This is the page right before we start Chapter 2.
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BORUTO第2話の前に――
Before the second chapter of BORUTO....
衝撃の第1話をおさらい!!
Let's review the shocking first chapter!!
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Splash Text:
崩壊した木ノ葉の里…衝撃の未来!�� �からのスタート!!
A crumbled Konoha...and a shocking future!? It starts from there!!
In a crumbled village, at the Hokage Monument...They're fighting in Konohagakure Village, which is supposed to be peaceful: It's Boruto and a character referred to as 'Kawaki'. The both of them seem to have a common 'crest'//'coat of arms' on their bodies, so what happened...?
Beginning of the Next Box Info (About the movie-recap):
冒頭から時は遡り、まだ幼き日のボ�� �トの時代へ。
For the beginning, we go back in time; to the era and days when Boruto was still very young.
Oh yeah, those people are just irritating, "muh opinion>authors opinion even tho the series doesn't go by what i say". Thanks for the info, anyways did you also notice the manga is following the novel?
Oh yeah, those people are just irritating, "muh opinion>authors opinion even tho the series doesn't go by what i say". Thanks for the info, anyways did you also notice the manga is following the novel?
Throw Kishi enough money and he'll give thumbs up to all the filler nonsense as canon as well. The fact that Kishi is not the mangaka should tell you enough.