Clickbaity headline to scare you for no reason with an easily detectable behavior. If a white box suddenly appears on top of all my other apps I would get really suspicious and start to uninstall apps until it went away.

That says, I do agree with the conclusion that granting permission to draw over other apps is dangerous.

I tested the demo app. Interestingly, the attack doesn't work on samsung oneui 5, as mentioned in the article. Where even stock android 14 is vulnerable to this attack.