Ann: Nuheara to Present at Automic Invest 2023, page-171

Its not just buds , its all audio equipment. you have a microphone, brought next to a speaker where a feedback occurs, that is what happens. Its not something that can actually be eliminated as the microphone and speaker are creating a feedback loop, hence the noise. In the clip he brought within range of his microphone that he was talking into while the bud was live.
It would not happen if you are wearing it.
He doesnt know what he is talking about nor is about articulation. It appears you dont understand the concept of feedback either.