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[2012]

This isn’t relevant anymore. This flag only affects older versions of macOS.

And specifically macOS hasn't used subpixel antialiasing since 10.14 Mojave was released in 2018

That's not true, I can replicate it in Chrome 96, macOS 11. It doesn't seem to work in Firefox though.

In Firefox, people historically used -moz-osx-font-smoothing: grayscale;

Yes, that’s what doesn’t work on my computer.