This is not a design system, this is just a UI library and an incomplete one at that. A design system would define semantic colors and fonts, a navigation hierarchy, and a far more exhaustive list of custom components that can represent all the possible types of data that an application ever needs to present.
Huh? Apple’s apps are consistent with their design system to a large and tangible extent. The typography styles, semantic colors, and UI components all exist in their SDKs for both UIKit and Swift. And when something changes (typically every WWDC), the HIG website gets updated. What do you mean they ignore it all the time?