It's certainly not only Chinese, although perhaps the author lumps all asians into that category. It's certainly very common in China and South East Asia.

I actually find it quite interesting. At some point, it's true, the home button was a common point of failure on iphones - and a kind of memetic "folk wisdom" idea was born that everyone should use the assistive touch button instead. This idea, which "everyone knows", persisted (and persists) long after the actual issue had been fixed. I am still seeing it today with iPhone 8 users! Hopefully the advent of FaceID finally puts it to bed.

Another good example of the genre is the "common knowledge" that you let your phone/laptop battery run down before recharging, and don't keep it constantly plugged in. Might have had some validity back in the days of NiCad - actively wrong advice in the age of LiOn. But the meme persists...

Can confirm. Many a time the owner of an iPhone has had to shift the floating dot around to show me something on their screen. Such an eyesore...almost as bad as the notch.