No points were gained because your opponent artificially boosted their rating.
Boosting is basically the practice of playing games against your own accounts and resigning them on e.g. the first move, to get a higher rating in one account.
Lichess will not mark you as a booster, but to make sure your opponent didn't keep bosting after being marked, I'm afraid you were awarded no points.
Note: I had to redact the link to the game due policy. We do not discuss cheating reports (or cheaters) openly, but through the report form instead. But I understand that you weren't aware that your opponent was a cheater, and that's fine.