Dragon Ball Daima has been confirmed as canon

Even though we already knew this, Akio Iyoku has doubled down on it and has said that it is a “fact”.

Quote from Iyoku:

While it's clear that DAIMA takes place after the Majin Buu arc of the original manga, Dragon Ball has expanded into numerous storylines over the years, leading fans to speculate about how DAIMA fits within the broader narrative. "For the record, since Toriyama-sensei personally wrote the story, it is indeed connected to the Majin Buu arc. That's a fact."