That article has zero benchmarks comparing the speed versus iOS, in fact iOS is mentioned just once in the entire article as far as I can tell, where it says that over time Android is becoming more and more like iOS.
Here's an article with benchmarks, testing exactly what you said, iOS 11 versus the Samsung Experience version of Nougat:
http://bgr.com/2017/09/26/iphone-8-plus-vs-galaxy-note-8-speed-test/
Great article. Don’t think your going to get a reply.