[Python] Python : Why is it said that variables that are only referenced are implicitly global?

From the Python FAQ, we can read :

In Python, variables that are only referenced inside a function are implicitly global
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And from the Python Tutorial on defining functions, we can read :

The execution of a function introduces a new symbol table used for the local variables of the function. More precisely, all variable assignments in a function store the value in the local symbol table; whereas variable references first look in the local symbol table, then in the local symbol tables of enclosing functions, then in the global symbol table, and finally in the table of built-in names
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Now I perfectly understand the tutorial statements, but then saying that variables that are only referenced inside a function are implicitly global seems pretty vague to me.

Why saying that they are implicitly global if we actually start looking at the local symbol tables, and then follow with the more 'general' ones? Is it just a way of saying that if you're only going to reference a variable within a function, you don't need to worry if it's either local or global?

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