U28 4K vertical distortion due to non-square pixels?

[rd111]

So it appears that the U28 monitor is not in fact 16:9 as stated, but something a little wider, closer to 16:8.79. This means that the veritcal axis is inherently squashed, being 97.7% of the horizontal width. This can be verified by comparing the ratio of 4k 3840 x 2160 resolution (which is 16:9) and the ratio of the stated active panel area of the HP U28, which is 62.09cm x 34.12cm (which is 16:8.79). This discrepancy is a result of the non-square pixels used in this panel, and mean that the monitor is incapable of accurately rendering distances. For example, a 10cm square appears 10cm wide and 9.77cm high. A 297mm tall sheet of A4 shown at 1:1 scale shows on the screen as 290.8mm – a difference of over 6mm.

Can someone check that I am not mistaken in this? It seems extraordinary that HP would promote a monitor for design use (even including a color mode specifically for print design) using a panel that is inherently 2.3% squashed along this axis.

And to see off anyone saying this discrepancy is negligible, print design frequently work in fractions of a point, a unit roughly 1/3 of a mm, so discrepancies on screen of 2.3% are certainly significant, and are not present in the more common 27" panels, which are 99.99% true 16:9 resolution.