The link you gave says "Harry Potter and the Order of the Phoenix -- Two Million Copies Sold in One Week" on its subtitle, so I think the Gamespot article stands correct but that the reporter may now have specified the month in which C&C3 was released (he may have been thinking May but used a vague pronoun causing confusion).
I think that the games have actually sold a combined 2 million copies and sales for regions outside America were underestimated, though sales in America could be higher (due to NPD under-calculating sales (see rationalehere)).
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The link you gave says "Harry Potter and the Order of the Phoenix -- Two Million Copies Sold in One Week" on its subtitle, so I think the Gamespot article stands correct but that the reporter may now have specified the month in which C&C3 was released (he may have been thinking May but used a vague pronoun causing confusion).
I think that the games have actually sold a combined 2 million copies and sales for regions outside America were underestimated, though sales in America could be higher (due to NPD under-calculating sales (see rationalehere)).