I don’t think landscaping is the issue. Jerusalem has 4 at most, and probably just 3. The issue is whether they can count hills that are outside of Jerusalem.
I’d think they cannot. But, it’s the only way to get to 7.
Rome, on the other hand, has at least 7 hills inside the 100 AD city boundaries.
I wish I knew how to find the thread, but I was shown a topographical map of the current Jerusalem, with three hills, and the ancient Jerusalem, which had seven inside the ancient boundaries.
But there's lots more seven-hilled cities to choose from. Which city was built on top of seven hills?