It partly depends on whether "time spent on screens" is counting time where a person's attention is primarily on the screen, or time when a screen is actively directed at a person.

As a few examples from my life (I'm sure there are plenty of other such scenarios too):

- There are quite a few hours in a typical week where my phone screen is showing a video, but just because I can't have it playing in the background (eg YouTube without premium, although actually I've just installed a third party app to get around that for YT). I'm actually just listening with a wireless earpiece or two while doing something else.

- Time spent with a friend where we're sort of watching TV, but more than half the time our attention is on our conversation not on the screen.

- Time spent multitasking, whether that's doing a hobby while also watching TV, or texting people while also eating, or whatever.

Those types of things can make the difference between a certain amount of screen time being a much smaller or much bigger part of a person's day.