What a bad joke.
In the upper picture the left side is hi-res and the right side is low-res.
In the lower picture the left side is low-res and the right side is hi-res.
Correct, I made it more as a test to see how far away from the screen I could still see a difference. The answer not that far, hence I see no point in native 4K.
Lean away until they look the same, divide that distance by 2 and you know from where you can spot the difference between 1080p and 4K.