SportBild exemplarily published
this yesterday.
Translation:
"The clear statement of Dortmund's director of sports Michael Zorc should end the months of speculation of a move to Manchester United. However, in England they do not seem to come to terms with the definitiveness of this decision. [...]
{summary of the transfer story up until now and a short report that United are still trying}
[...] The English international is currently preparing with the BVB in their training camp in Bad Ragaz (Swiss) for the upcoming Bundesliga season. He seems to have accepted the decision. Apparently in contrast to Manchester United..."
That doesn't sound like the SportBild is convinced this is still on from Dortmund's side.