If you look closely, after it understands "play" command, there's a progress bar. If the user doesn't respond it would go to the music player automatically. He cut it short and clicked "Play", probably for TL;DW people.
I don't understand how parent can write such a lengthy comment without watching the entire video and understanding what they're talking about. Even the parent's disclaimer states they are only going by the video, but it clearly shows they didn't watch it fully, since what they missed is contained within the very first minute of the video, multiple times.