Did Mac OS recently switch from 72 DPI to 96 DPI?

Question

Did Mac OS recently switch from 72 DPI to 96 DPI?
I ask this because my MacBook renders text at 96 DPI, whereas I read everywhere that Mac OS (X?) renders text at 72 DPI, and MS Windows renders text at 96 dpi.
Note I'm only talking font points to pixels, not pixels to screen (which is dependent on the display).
For example, on TextEdit in plain text mode a 16 point font is rendered at 21 pixels, and that corresponds to 96 DPI (if it was rendered at 72 DPI, it would be 16 pixels instead of 21).
I had a look at the "System Profiler" > Graphics/Display, but I couldn't find a DPI value. It only mentions resolution (e.g. 1366x768).
So, do you know if Mac OS recently switched from 72 DPI to 96 DPI? And if yes, do you know at which version it made the switch?

Answer 1

Thanks Kurt, but this was not the info I was looking for.
My point is, how comes my Mac is behaving as a 96 dpi OS, where this is not documented anywhere that I know of?
In fact, as I said, I've found plenty of documentation saying the mac is a 72 DPI OS
(for example, wikipedia) and, even after extensive googling, I have found none saying it is a 96 DPI OS?
In fact, everywhere it says Windows is a 96 dpi OS, and I've verified that.
Every rendering engine has a specific DPI count, which does NOT relate to the question "how many pixels (or points) do I need to specify if I want my text to be x inches tall" (by the way, I call that "pixel-to-screen" resolution, or "points-to-screen" resolution). That depends on the screen.
The DPI I'm talking about answers the question "how many points do I need to specify if I want my text to be x pixels tall". I call that the "points-to-pixel" resolution. That doesn't depend on the screen, it only depends on the OS (at least, when there's no "software" zoom, that's why I take TextEdit as a test on Mac, and Notepad on Windows).