I think it's important for kids to interact with dogs and do training such as the above.
My niece who is 2 loves telling the dogs to sit and down to get a treat.
My oldest nephew thought it was amazing all the things Zara could do, I think he assumed all dogs could do that until he tried it with another dog. lol
I was watching the video... and when the litter girl said "come" Maisy my mums westie stopped chomping on her bone and came running over and she sat in front of me when the little girl said "sit" lol
She is the westie I do OB with.