There's a massive spike in mortality for those who retire from work versus those who keep working. In fact, working just a single year after you're 65 is associated with 11% lower risk of death for healthy people and 9% for unhealthy.
Working is objectively good for your health. Stopping work is associated with an extremely large increase in mortality risk, for both healthy and unhealthy people.
Any alternatives must weigh the resulting death it will cause.
Did any of that signal come from people who hadn't spent the last 40 or 50 years working, in a society constructed around working?
If I had a study that showed increased mortality in people who had owned a parrot for 50 years in the year after that parrot died, you wouldn't cite it as evidence of the basic human need for a parrot.
How are we sure about the direction of cause and effect here? I'd expect more healthier people to self-select the working cohort, all else being equal.