WizenedEE:
The thing you quoted says that bool is a standard type. Where did you see that bool is typedef'd/mapped to _Bool? Neither _bool or _Bool are mentioned in the arduino libs.
In [your arduino location]\hardware\tools\avr\lib\gcc\avr\4.3.2\include\stdbool.h you will find
#ifndef __cplusplus
#define bool _Bool
#define true 1
#define false 0
#else /* __cplusplus */
/* Supporting <stdbool.h> in C++ is a GCC extension. */
#define _Bool bool
#define bool bool
#define false false
#define true true
#endif /* __cplusplus */
Which make it dependent on whether you compile as C++ or C whether it will be _Bool or bool.
I have searched for the definition of _Bool and bool in the GCC documentation and it seemed like an integer to me. But I did not find anything remotely close to a "clear answer".
As I am not using bool but boolean -and as I consider this splitting hairs- I don't really care and I did not put much effort in it as well.
Best regards
Jantje