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What does modern mean in this context?

“Modern C++” is a phrase to refer to newer C++ versions. In this case, it’s C++20.

From my experience, people say "Modern C++" to mean C++11 and newer. That was a real turning point and when I started to see that phrase used.

Yeah I agree. It's just meant to distinguish from legacy C++, basically the era before unique pointers (and thus move semantics etc.).