Now that you know this, ask yourself, what these people on this livestream know about anything?

They don't know what they're talking about.

One is a flatearth influencer, the other is a scientist wannabe. They are young and ambitious, talented, sure, but they don't know what they're talking about.

The scientist wannabe brings up an extreme version of the Cavendish experiment. Unnecessarily. The regular Cavendish experiment suffices.

The influencer responds with an argument that could be compared to saying "electricity is everywhere, because electrons are everywhere, so don't touch that wooden table or you might die."

It's a childish dialog.

I suggest you diversify your sources of information. Not being hateful, just a legit advice, because when I realized this in my life I became a better researcher. Diversifying sources is good.