Listening to frequencies with bone conduction headphones

Someone on Tiktok claims to have built a headphones that can alter the current frequencies of your brain. He also developed an app for it (registration required + subscription), but from what I understand it's just about listening to frequencies. So any app will do. I bought cheap bone conducting headphones to test it out but nothing really happened.

The people in his videos are actually going insane about this. They feel it in their whole body, it doesn't look staged. You can see how they instantly relax or they feel a sudden shock of focus when the guy changes the frequency in his app.

Has anyone tried this before? Maybe my cheap headphones don't transmit the lower frequencies effectively for me to feel something. Can someone test it with their more high-end devices and tell me their experiences? Apparently it's a new topic, I can't find any discussions on it.