Yeah, I put it a bit on the edge, but you can see why he went to Dortmund, especially seeing as he has already said no to Juventus once before due to wanting secure game-time and focusing on development when he went to RB Salzburg.Ronaldo is 34. At some point he will have to retire. Haaland could grow under him and replace him in 1-2 years. I mean nothing is guaranteed, but that's something you can plan for. Either way, I think we can agree that Dortmund is very unlikely to win any trophies, domestically or in CL, so there's that.
I don't think Dortmund will win, but they will compete at least. And they are good at developing. If he backs himself to push them onwards then I could understand it if he thinks Dortmund is good enough to win trophies.