Maybe the probability of dying per climb is only a few percent. But probably goes up as the climber gets older. And if you are exposed to that high risk repeatedly, it's almost certain to kill you eventually.
Of course everyone dies eventually, but I'm guessing the life expectancy of free soloers is significantly below average.
Once you get beyond measuring the extremes like childhood & maternal mortality I think life expectancy is such a dumb stat, especially in developed countries where we rarely lead subsistence lifestyles. It should be about the contents of your life, and if you love climbing so much that you keep free-soloing to the age that it literally kills you I can't accept that as any sadder than quitting and then dying of old age.