Exactly.
There is a combination of factors. It is the best compromise between having a local representative and a national representative. The more votes a candidate garners in the constituency, the greater their chances of being elected.
There is something else I mentioned that in my brief but did not have the time to tell you. All the candidates who win 50% of the votes can be excluded from the calculations, because it would not make sense to bump them after they had won. This method, which has the benefit of absorbing all the distortions by balancing the factors, was simulated for the United States where arbitrary constituency boundaries is a major problem.