This cache is not at the published coordinates. It's a bonus cache for those who've solved the 7 Hills of Edinburgh multi. The actual coordinates are in the 7 Hills cache.
Once you've done all the hard work of solving the 7 Hills of Edinburgh multi, you'll want to take a wander up here to admire the view of all 7 hills and all your hard work. So pick a day with good weather!
The difficulty rating reflects the work done to get these coordinates. The terrain rating reflects that and also what's required to reach this cache.