There Are no such reports. There was one guess at it months ago, one echo of it, and the shit didn't stick. The only place it stuck, is here where it gets repeated often. No other speculation merchantnhas even bothered to punt it, that's how poor an attempt at clickbait that was. And there is also no logic in it, even for the wishful thinkers or for it to be true.
Agree Haaland's camp might have a chance of getting more money in the summer and having more options, but on the other hand, they may well get what they would get and accept both in january and the summer, so might not be as black and white that one.
Ultimately, his injury may play the biggest part in stopping any January move. For both him and a buying club. He may want to recover at Dortmund on familiar territory and a buying club may want to see the outcome of that recovery.