Files is an iOS feature. It was added in iOS 11. This new update just has new cosmetic features like the column view. I'm sure the external drive and server connections work on iOS as well.
This is because iPadOS is just a marketing name for iOS 13. iPadOS still runs the same Springboard as iOS and is referred as iOS internally.
The iPod touch launched 2 months after the original iPhone launched, and they both ran iPhone OS. Why are you so stubborn over something that can be easily searched and debunked?