Absorb life says it gains +1 wound for every unsaved wound it inflicts. If the doom inflicts one wound on a creature that is T3 it gains +1 wound, even if you Instant Death, you have still only inflicted 1 unsaved wound, but for combat resolution you still count as if you inflicted 3 wounds.
As for Sweeping advance, since you are not inflicting wounds you do not gain any, even if you manage to SA a 29 strong unit, you gain nothing because SA does not inflict wounds.
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