I agree with the sentiment on faux K panels 100%. However some of the information here isn't entirely correct.
QuoteSome of these panels, however, would utilize dedicated white subpixels in addition to RGB and so they were not "true" 4K.
These panels did include white dots, and it's absolutely true that they didn't increase density to fit them in the same regions that should already be occupied by RGB. However it's worse: the displays also reduced the total number of dots per denoted pixel to only two: RG then BW (or WR then GB). So the number of effective pixels per row was actually
1920 not 2880.
Really, these panels are best called "RG/BW" and "WR/GB", not "RGBW" and "WRGB". Omitting the slash or other delimiting character fails to properly summarize the issue.
The 2880 case did apply to some LG faux-K TVs.
Indeed, in the article you linked, you can find a comment by me where I already clarified all of this, four years ago. It feels as though I've done my part to correct some of the tangentialities on this subject, so why is Notebookcheck still presenting it inaccurately?
EDIT: The 2880 note has been corrected (removed), so thanks for that! However we still need the terminology updated and a few wordings tuned up.