That's a lie, you know why? Because I've actually counted it, it's less than 20% wrong. And it's mostly because a rule of thumb got grossly misapplied: if you want to know if two questions are duplicate, look at the answers; if they are mostly the same then they likely to be duplicate.

It got grossly misapplied because it became "look at any answer, if one of the answers it the same, then they are duplicate". Note how likeness became overlap and likelyhood became certainty. Two questions where restart might solve the problem became duplicates under that absurd policy. Your example on the other hand I didn't find. I didn't find anyone claiming that two questions are duplicate of one another in different programming languages unless the language is not relevant.