The two are at least partly linked though. If you are dismissed, the dismissal may be unfair because legislation doesn’t allow for dismissal in those circumstances (e.g. because if you are dismissed for getting pregnant or undertaking trade union activities) or because your employment contract doesn’t allow for it. Alternatively, the dismissal may be unfair because although the end result was correct, the employer didn’t follow the rules correctly (e.g. you didn’t get the chance to appeal or the timescales in your contract weren’t followed). In these cases the tribunal can decide you were correctly dismissed but award compensation for the company not following the rules correctly - but the compensation in these cases will be pretty small.
Given the amount the tribunal awarded, they are saying the dismissal should not have happened I.e. Derby had no legal grounds for dismissing him for the “offence”