It’s possible it works on yours, but mine is the iPhone 6s+ and it doesn’t show up. Maybe has something to do with the larger format of the 6s+.
If you notice my screenshot in my post on the first page of this thread, it doesn’t scroll all the way to the bottom of the version list as your’s shows. Mine appears to be at the top of the version list and I’m not able to scroll it down, where your screen shot is at the bottom of the version list where the ‘buttons’ are.
(I’m running iOS 11.2.5 on my iPhone 6s+.)