From here: https://www.reddit.com/r/lostmedia/comments/c1x5pl/lost_port_of_lego_racing_game/
"So about a couple of years ago I made a post on the lego forums about a possibly lost xbox port of lego drome racers But since those forums have been shut down I am posting here. there are pictures of the box art and the wikia page says that it was a Europe exclusive but I can't seem to find any ebay listings or any gameplay footage of this version. I remember somebody saying on the forums that some reviewers from back in the day reviewed the xbox version. If you can help me that would be cool"
The Xbox port of the game was officially canceled, otherwise it would have been released at the same time as the GameCube port. However, files have been cropping up of the game over time.