I have a 2013 Chrome Pixel, with 240 dpi, and I’ve also found that the Xft.dpi setting takes care of nearly everything, although there are some interface elements in some applications that still display tiny type. The author seems to be suggesting that 163 DPI is high resolution; is it commonly understood to be so? Because that would look a bit fuzzy to me.
This is not true. Your pixel density is a function of your resolution and dimensions. “HiDPI” is a nebulous term that refers to high resolution screens that are also relatively small.
As the phrase "dots per inch" implies, it's a ratio. Specifically, it's the ratio between your resolution (say, 4K) and the size of your screen.
What is "not true" is that every screen's pixel density is the same. Different screens have different sizes and resolutions, which means they have different pixel densities.
Sorry, I badly misread your original comment: I read it as "I saw [a reference saying that] the two were the same," not "I've seen at least two displays with the same density."
