According to https://tools.rodrigopolo.com/display_calc/, a 65" 8K like the one in the article is retina at a 26" viewing distance (136 PPI). For reference, a 27" 4K screen has 163 PPI, and is retina at 21" by the same math. A 27" 5K (like the Apple Studio Display) has 218 PPI and is retina at 16".
The DPI of this screen is too low for all the drawbacks. Would rather have crisper text (150+ DPI, 200 preferable) and/or be able to carry it myself. Needs to be about 42" for that.