Tl dr Emulator framerate counter is just displaying the output frame rate that is displayed on the modern monitor. Modern emulators just run everything at 50/60fps, progressive scan, either by just displaying it scaled up (for progressive scan content), or deinterlacing it.
It's usually 2x because both past and modern monitors typically display games at 50/60hz (disregarding high refresh rate monitors), and also because it's easier to code the logic for 2x output framerates.
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