Correct me if I'm wrong, but this is how I understand it:
If a club is liquidated during a season, then it ceases to exist and cannot complete its fixtures. Therefore all league results will be expunged, including goals for and against as well as any points gained. So even if you'd lost twice to the liquidated club, then your goal difference would improve.
If the liquidated club is still in any cup competition, the last team they knocked out could be reinstated, or their next opponents given a 'bye'.