That's really quite witty: it appears to be using (or simulating?) the different typographical engines on each platform as a visual cue as to which is which.
I'd say the weirder thing there is that they assume all "non-EFI" is "Windows", yet don't seem to assume that all "Macintosh HD" is "OS X". You're being asked to pick between a device and an operating system.
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Because Windows deserves no better?
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(If you select the Windows drive, does the font change?)
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