Re: From your article 2nd July Andrew.
On OLED screens the notch doesn't have to visible. It will only be visible if the background to the status bar is not black.
Apple made a point of making the notch visible and insisting that developers don't hide the notch.
The Vivo X21 phone has an optical under-the-display optical fingerprint sensor, sold in India a couple of weeks ago. It is possible that the article you refer to is about ultrasonic under-the-display finger print readers, I can't remember.