Every viewing terrace in cities I've been to have a view that lets you see in other people apartment. That's pretty much expected in cities, if you have large glass windows people can see you, and that's why curtains exist. I don't really see how the terrace is the issue here.
I'm looking at the pictures in this article and that doesn't seem egregious: https://www.bbc.com/news/uk-england-london-64481260