Not always, at least for me, with which version did you check?
It apparently went missing until 5.16.
As a minor nitpick, according to the definitions in perlglossary I'd rather use built-in and not operator to describe say, though the differences are indeed fuzzy.
Builtin functions are a slight superset of what both perlop and perlfunc call list operators and named unary operators. say is a builtin because say is a list operator. (It's fuzzy which builtins aren't operators.)
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