I don’t think this article makes the right comparison to determine whether people switch jobs more often “these days”. They only go back to the mid 2000s.

When I hear or talk about the idea that people change jobs more frequently now, I definitely include people who started working then, and I don’t think a decade is sufficient time to see a trend in tenure. I’d be more interested in a comparison between the 00s/10s and the 60s/70s/80s (ish).

Stratifying by age would probably be more informative than simply comparing the median tenure in two different years as well.