UHD features a 16:9 aspect ratio and is twice the resolution of full HD.
According to Wikipedia resolution is:
The display resolution or display modes of a digital television, computer monitor or display device is the number of distinct pixels in each dimension that can be displayed
No they specifically say
According to Wikipedia resolution is:
https://en.wikipedia.org/wiki/Display_resolution
Resolution is the number of pixels in both dimensions, so they are wrong