yes exactly
"for the duration of a single combat, (if the ability is not Sustained)"
and then
" Some non-sustained Squad Mode abilities have a duration different than single combat and are indicated as such ."
Then they go on to Errata the majority of non-sustained abilities as having a durration other than one combat. they make no such indication about this ability so it defaults to the standard one combat durration. Only 3 are in fact not changed from full combat to one turn: Tank Buster, Go to Ground and Soak Fire. It would have actualy been less of a change to say the default is one turn and then say these 3 last longer instead of changing 7 abilities to be 'indicated' as having a different duration than one combat.
We were asking for you to point out where Soak Fire was specified to only last one turn or some other durration than one combat.