One caveat. The study claimed to follow people living with handgun owners. Unless I missed something, it seems to indicate, without explicitly stating, that it is not following actual gun owners.
As for the question there are a few examples I’d proffer that would not appear in this study but would be a positive indicator for “living with a gun owner”. A home invasion or attempted theft that gets repelled due to having a gun. Incidents where injuries occur but no one dies.
It was also unclear if they would count a homicide of the suspect should the “person living with a gun owner” prevail.