This is the original video uploaded here by Mike Girard:
If you pause and unpause the video rapidly as he is turning on the console, it is apparent that the ding noises from the game actually start before the console is even powered on. Light travels faster than sound. During the boot-up sequence (when flashing on screen), the game sound would not be audible until the exact moment after the flash is seen. This is not the case in the above video.
I can also attest to the fact that the videos (at least 3 of them) were uploaded and then deleted from Mike Girard's account, and I know that these were not uploaded to a troll account or impostor's because the above video that Mike Girard posted for his record verification here was also uploaded on the same account those other videos were uploaded.
EDIT: Actually, you can see the console red light powered on before you hear the sound, but how would the sound play before you see the flash on the TV itself?