o.k so i have heard this i am not sure but they are believed to be in Nineveh not in Babylon. I am Assyrian by the way.
https://news.nationalgeographic.com/news/2013/13/130531-babylon-hanging-gardens-nineveh-seven-wonders/
While it doesn't directly address the article you cited, you'll be interested in this answer by /u/mythoplokos!