That increases the likelihood that coffee is the cause of the decreased risk of death.
Other studies have also had similar outcomes.
One intervention study did find that coffee consumption was able to reduce the level of background breaking in DNA strands.
A second study found the same outcome for dark roast coffee.
That effect could help to increase life length or decrease the risk of death, but the studies didn’t look at the implications of the change in DNA breakage.
It is important to note that the vast majority of studies on this topic have been observational in nature. That research approach means that it isn’t possible to test whether coffee is causing the observed effects.