I don't think I need to tell hacker news this, but don't scan that qr code with phone.
The only way HN is going to do that is by opening that link with either a js disabled browser and then opening the qr with a sandboxed android emulator.
you can also open a URL with another tab
press F12 and open the STT page URL and you have both the avatar and the STT page (where you use it as microphone) on the same computer without the need of phone, this design was to eliminate the need of microphone and setup user base sessions and control it in kiosk like environments
The only way HN is going to do that is by opening that link with either a js disabled browser and then opening the qr with a sandboxed android emulator.