"Your Request was denied..."
7 years ago
England

It was denied because the game already exists, even if the mod is inactive - The game was also not added a year ago, that was the game's release date (Seen on the Steam store page.) The account of the mod for the game is 15 days old, active 14 days ago so was probably requested on that day.

If you're having trouble with an already present leaderboard you don't request the game, you need to head over to the Leaderboard Mod request thread. http://www.speedrun.com/The_Site/thread/63nr7

United States

Statistics has the actual board added date: http://www.speedrun.com/Dino_Run_DX/gamestats