While I agree that has been the case, it seems the new book coming next year, Keys from the Golden Vault, may be going for some synergies with the movie.The only thing I disagree with is the idea that anything that is written for any of the D&D books are due to them needing to be ready for some television or movie thing.
- The are both heist themed
- The toy line mentions the "Golden Archive" and the book references the "Golden Vault." These may or may not be related.
PS I don't have any issue with this approach.