To add another nit-pick to the list, the author confuses 18K as being four times the resolution of 4K.

8K is four times the resolution of 4K. (counter-intuitively to most people as it only measures the pixels in one dimension yet the image resolution is increased in both width and height)

Diagram:

https://i.pcmag.com/imagery/articles/07toBDd6lpyucCyM0xWrcQv...