To your first point, "the rule" is location-dependent. And to your second point, that was obviously (to me, at least) implied.

I’ve never seen a four way stop in a region that had traffic on the right can always go regardless of stop time. But I’ve only seen four way stops in a few countries.

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The implication from the comment was (had to be) that you yield to the right if both cars stop at the same time.