Precisely.
The reality with Naruto is that there is no canon. The so called ending combined with The Last and everything that came up after rendered the entire Naruto story from chapters 1 to 698 as pointless. Making them non-canon.
It doesn't matter what was said or done in those chapters because it has no meaning anymore because what came after erased them from existence. And the same thing could and will happen to whatever crap they're releasing these days.
One day they will release either new chapters or anime series or just a interview that will declare that what is done today never happened. Saying it's not canonical. Saying that whatever they do then is. But don't worry will be declared as non-canonical as well later on. In a way you could call it "The never ending cycle of Naruto" where nothing is really canon but what Kishi/they say in that moment in time.
And what Kishi/they said will only be canon until the next time Kishi/they say something else or do something else.
Nothing is canon. Everything is permitted.

For me, that where the story end. The rest come out from a different timeline. It literally make no sense and throw everything that happen before out of the window. What sad is that Naruto for me end up like on of those TV show that got good at some point, but the guys knew the show was cancel so they butchered and rushed the conclusion, making the whole experience a mess.
Thing is they now tried to milk the franchise, but it's not as great or as popular as it once was (at least for me.) On Netflix, Naruto 1st part arrive. The good old day. Seeing that make me feel sad, angry and disappointed at the same time. Either he didn't think it through with what he was doing or plain lose control, either still hurt by that. I didn't watch much anime and honestly Naruto didn't make me watch other anime. (The only other I watch was dragon ball)
Thank god I watch Hunter X Hunter (2014), Kill la Kill, One Piece and Rurounin Kenshin afterward. Only One piece is still ongoing and while being longer than Naruto, it's doesn't feel like a drag to watch what happen (cuz that's how I felt during the whole war arc). All of those were fun, fight where great and for the 3 that got an ending, it end well and I felt closure on those story (Hunter X Hunter might continue in book, but there is no update for a long time)
Anyway, Kishi make a mess of this story. Even if it is the author and what he said is canon, as a writer, he must be coherent with his sotry and if he changes idea on a whim, it must be done within time and explanation, not just pop those in a story without a explanation, misleading everyone with OBVIOUS parallel and thing like the new generation will surpass the old one. But it is the freaking sage of the 6 path, who gave both Naruto and Sasuke power to ended the fight, which said to be the father of all ninja, how older can you get. Notstarting on the whole 4 Hokage incident showing how a whole battlefield of ninja are worthless.
It might sound whiny and all but at this point, he loses all right for me to tell me what to believe on his story. That why I say people decide what's canon. He failed to close the story properly. Those questions are just small example of what went wrong.
How Naruto surpasses the previous Kage? With hard work or by being a godlike entity? Without Kurama, does Naruto surpasses the previous Kages? How many wind ninjutsu Naruto knows except Rasen-Shuriken?