He's talking about something different. While dalvik's going away and apps will soon be compiled with native code, Android apps can already bundle native code in with the app through Java's Native Interface API. Such code is architecture specific, and usually only available for devices running under ARM, with occasional support for x86 processors. Additionally, some native code would only be available for specific architectures; Firefox mobile won't run on older phones because it requires an FPU, which wasn't guaranteed until ARMv7.