'#!' is implemented by associating file extension with some specific application. For example you can associate '.py' files with 'python.exe' and when you double-click on 'app.py', it'll be launched using python. So it definitely not this thing.
I, personally, didn't understand what this article is about and why would I use this mechanism when simpler one exists and works for decades.
I, personally, didn't understand what this article is about and why would I use this mechanism when simpler one exists and works for decades.