No, because many including myself already think they are canon.
More content released after the end of the original manga to fill in the gaps between 699 and 700 just like The Last.
Kishi is also drawing the illustrations, no reason to see this as anything other than canon.
The only reason why I am not already calling it canon is because people will bi*** about "no official statement", I think that's really just nitpicking.
OD herself hasn't said they are canon yet. She has read more interviews and stuff than we have. If it was canon, she would say so, but she hasn't said anything definitive (Yes or No), which means she doesn't know for herself. I remember when people were debating about The Last, she translated a bunch of Kishi videos that said that he was going to show what happened in between 699 and 700.
No such statement for the novels.
Plus, the Blood Prison stuff is not canon.
I believe OD goes by Japan standard though.
Manga + The Last= Canon
Novels + Anime + drama CD's = non-Canon.
It matters because Kakashi has a new jutsu. And if people use it in debate threads, people better agree if it's canon or not.