In my opinion this is no longer a skyline. But it's best to wait for someone else to decide whether or not this picture is valid.
The reason I think this isn't a skyline anymore is because of the perspective of the viewer. In this picture the view is from the top which gives information about city layout, street patterns, etc. A perfect skyline doesn't tell a lot about street patterns and layout, it just shows you the buildup of height with skyscrapers. This picture leans more towards the first, where Vaduz (although not a perfect skyline) leans more towards the first.
But as I said, let's wait for someone else to comment.
The reason I think this isn't a skyline anymore is because of the perspective of the viewer. In this picture the view is from the top which gives information about city layout, street patterns, etc. A perfect skyline doesn't tell a lot about street patterns and layout, it just shows you the buildup of height with skyscrapers. This picture leans more towards the first, where Vaduz (although not a perfect skyline) leans more towards the first.
But as I said, let's wait for someone else to comment.