I think it does. It gives average times spent on certain activities for people aged 15-64 across several countries. As long as you understand what each of the bolded phrases mean and the influence they have on the outcome, it's a very useful and interesting graph.

There's a reason statistics is an entire field. Making assumptions or expecting a graph to say something it isn't is super easy to do.

You can go down that rabbit hole for years. Unemployment rates in each country will also skew numbers. So can social security/retirement qualifications. For an analysis like this, you have to pick a range, and you have to apply it equally against all test subjects (in this case, countries).

I'd guess they made their choice based on a calculated averages of starting/stopping work.

I mean, that's how averages work. They're one view of the data, that includes the extreme values. They aren't a complete picture, but they have their value.

In this chart, the exact values aren't what's being showcased, it's more how values compare between countries.

It's an average over ages 15-64. So they're including a lot of people whose work hours are close to 0, which is going to lower the average.