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When someone did write a canonical answer and we started closing questions as a dupe of it someone took exception to us doing so just 3 paragraphs earlier than your quote above.
It would appear that you only get the new badge if you cast all 40 votes. @Holocryptic gat a suffrage badge for casting 33 votes which was all he was allowed to cast.
I suspect like a few things they only make it easy to find once you have a certain amount of rep. I could use serverfault.com/review before I got to 10k
