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It sounds like you're ultimately just saying that the 77% number doesn't feel right to you.

I agree that it's an interesting challenge to try to determine which language a large number of sites are using for the backend, or at least it would be a challenge in some small but maybe not insignificant percentage of cases. And no doubt whichever way they solved it involved compromises.

But that by itself doesn't give us enough information to draw conclusions about accuracy.