This also plays a major role in Frederick Forsyths book “The Fist of Good”. It pretty much mentions all the things in the article, I was actually surprised how accurate the book is.
I find the science and history of so-called "super guns" very interesting, and this article was no exception. Disappointed only slightly there wasn't more on the background of these weapons, such as the Nazi V-3 Cannon: https://en.wikipedia.org/wiki/V-3_cannon
If that's piqued your interest, you might also be interested in disappearing down the tangential rabbit hole that starts off with reading about Schwerer Gustav: https://en.wikipedia.org/wiki/Schwerer_Gustav
The movie is not very good sadly. It is a strange attempt to romanticize a man who ultimately just wants to make a really big gun because when he was a kid he wanted to build a really big gun.
