It's not evident. I've had a fairly long career in tech (both as an IC and as a manager) and many execs I worked with didn't do much of really impactful work. Sure, they attended a lot of meetings, created spreadsheets and slides (while they were attending the meetings). They left work at 6pm, with the rest of us, and came back to office at 9am the following morning with the rest of us. I don't remember ever feeling the pressure to respond to an email or Slack message sent after 6pm, and the overall number of times I received those was not large. Typically founders worked more than the rest, but that's not surprising. I'm talking about execs below C level.

Execs probably have a higher ratio of BS artists, and SWEs have a higher ratio of slackers, but overall the fraction of workaholics is about the same.