You need to look at it through the lense of what they can substantiate. These findings are based on genetic study. Archeologically speaking, we know it dates back a minimum of 20,000 years or so, back to the Admomites and therefore the Scythians.
Nonetheless, you are correct to call them out implying it's a complete picture. It is not a complete picture. It is, however, a confirmation of other evidence. Nonetheless, the important take away is that blue eyes originate from a singular mutation of Aryan/Scythian origin. Where ever you find blue eyes, you find a tie back to Aryans.
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