Hello there, @asekar ...
Sorry to see that your question has been sitting out here for so long without any kind of reply. While I do not have any experience with Google Sites, one thought I had for you was this... have you considered reaching out to the author of that video, Chris Burcin? It looks like he is allowing people to comment on the video that you linked to, and so if you were to post this question to his video, he would see it and have a chance to help you troubleshoot this more. Again, just a thought as I was watching that interesting video you shared.
I hope this will help a bit. Please let Community members know if you have any other questions about this...thanks! Take care, stay safe, and be well.
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