i don't read that quote as establishing a relation between main- and dual wield-attacks. to me it just means you can only get a double attack on your offhand if the dual wield check was successful (i.e. you swing your offhand).
it doesn't say anything about the (in-)dependence of main- & offhand.
i looked through alot of the patch history on allakhazam and couldn't find dual wield mentioned anywhere.
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Xenu / Shalaya
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