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It's just a bootloader. I don't think they changed much between iOS 9 and 11. The probably only added support for newer boards/devices.

The article states that the code is from iOS 9, which was first released in 2015.

There are a few references to 2016. There is also a target/iphone8 folder. Don't see any reference to iPhone X though.

"iphone8" might not be a reference to a product name but the internal model numbers "iPhone8,1"/"iPhone8,2" which are the 6s and 6s Plus (released in 2015). The iPhone 8 model number is "iPhone10,1"

edit: there appears to be a reference to "N66" in init.c, which is the codename for the 6s

The iPhone 6S, which was released 2015 with iOS9, had the hardware string 8,1, so nothing unexpected there.

https://en.wikipedia.org/wiki/List_of_iOS_devices#iPhone