That's screen on, though, if you look at the title of the chart. That's probably no worse than my Pixel 3 (which is by no means an endurance athlete, but is probably fairly representative of the Android mass market).

The lack of screen off times in the article is definitely worrying, though. That's just as important a metric.

Edited to add: actually, the first graph is screen off, I think. Looks like it's a tick under 10 hours. Which is poor, so I hope there's more scope for software improvement, but I also think is a fairly significant improvement over where they were 6-12 months ago.