Is it any less credible that soneone who belongs to a supporters trust claiming to be an in the know having insider information that Wenger had decided to go ages ago?.
No we don't know anything for definite, we have Pulis who has said Wenger has told him he wants to stay (is he really going to tell him his true intentions).
However at the same time we know the media are putting out stories indirectly from the club, the Sanchez leak, the "they've never had it so good" narrative etc.
So yeah we don't know, the one year contract thing seems to be bullshit.
But given everything Wenger himself has said in press conferences, given everything anyone who has any kind of inside access to the club has said.....Wenger has no intention of going anywhere and it seems more that the club are doing its best to lay the ground for that decision.