alt Hacker NewsThis feels to be strongly in the “correlation does not imply causation” bucket. Something like being in the sun means you’re outside and therefore not sedentary fits with our current understanding of health and might balance out the increase in mortality due to skin cancers
The study was on Swedish women. I've heard doctors tell me before that it's more likely to die early from not enough sun then to die from skin cancer(due to too much sun), if you're a Swede.
We don't get much sun up here!
If you live somewhere further south (Stockholm is at 60N, so you probably do), your milage is very likely to vary.