Nothing short of a contract extension would be conclusive enough for some people.
Even that wouldn't be seen as reason to believe he will be here next season.
He has spoke about planning for the future
Spoke about planning for the summer window
Now spoke about winter training camps away next year
He is, 100%, mentally in the space that he will be here at the start of next season.
It doesn't really matter though what he thinks. Every manager in the league is planning for next season as they have a contract for it. A certain proportion of them won't see it though as the people above them will fancy a change, we just have to hope our majority shareholder feels the same.