It definitely chopped out a bunch of his natural frequency but it was clear enough to hear him without issues. Earlier in the video he did more normal tests like removing the sound of his keyboard in which case his voice's frequencies were mostly left untouched. He also banged a hammer on his desk while talking.
i have an Asus microphone adapter which does this noise cancelling in the dongle. It was marketed as "AI" but i'm sure it's just fancy DSP in the ADC onboard. i use it with a $5 no-name clip on lav mic.
I don't sound fantastic on it, but i sound better than people using cellphone microphones and thrift store microphones. It also works if i talk loudly from another room, but won't pick up normal volume conversations in the same room, which means there's a noise gate in there, too.
I've heard a very abrasive sneeze sounds like "chew!", like a cartoon sneeze or something. I couldn't tell the difference in a blind test between a cellphone's noise cancelling with the sound recorder and the asus device vis a vis overall quality, but the gating on the asus is more aggressive. It also works better than the default discord noise reduction, but is about equal to the Krisp (iirc) implementation. Its gate is faster than discord if you have both krisp and the normal noise cancelling on.
I think they're discontinued. If i ever see one in the wild i'll be sure and buy it. I have never tried it with a decent microphone - and i do have a couple, including shure and marantz - because there's no need. I wouldn't use it for podcasting or doing anything where the overall quality would be noticed; but for discord / in game / PC telephony it works great.
Over 4 years ago nvidia released a feature that lets you remove arbitrary background noise in real-time.
Here's a video where a guy put a fan, vacuum cleaner and leaf blower right next to his microphone: https://youtu.be/Q-mETIjcIV0?t=535
It definitely chopped out a bunch of his natural frequency but it was clear enough to hear him without issues. Earlier in the video he did more normal tests like removing the sound of his keyboard in which case his voice's frequencies were mostly left untouched. He also banged a hammer on his desk while talking.