I guess what they meant is that third-party apps are much stricter on iOS (at least partly because Apple updates faster and for longer, probably). I was on Android 8 (2017) until recently without any issues, whereas iOS apps only seem to support 1-2 versions back generally. Plus the Safari rendering engine doesn't update independently so you can't fall back to the web.

That's because the iPhone 10 is still being supported so you likely have the latest iOS version

The difference here is that an iPhone X (damn, that came out 6 years ago?) is still supported