Small contrast areas? Explain to me how the color is black. It doesn't just look black, it is black. There is no red in it. The colors aren't shifted.

And look at what you're suggesting:
https://en.wikipedia.org/wiki/Chroma_subsampling

It doesn't even do what you're claiming it would do. The debunking of this is hilarious. Where did you even get the idea that chroma subsampling would do this?

The important part is that the printed paper disagrees with your chroma subsampling explanation in an obvious way.