The analysis is interesting but depends on accepting a premise that is only substantiated by fictional anecdotes.
All the virtuous skeptics here would just be calling the study flawed.
I would be content with just a statement like "these are real people I personally know (anonymized)."
You can either use that to get more done or get the time back. Lots of people choose the 2nd option. Especially if they can wfh.
And the idea that someone who works late (9-7) isn't working.
Like, what?