I'm not sure which exact methodology they are referring to. It would be helpful to see it. I'm hesitant to comment on it without seeing it.
What I can tell you is that on-time performance, in my view, is not a methodology for measuring competitiveness or market concentration. What you need to look at is how many firms are serving a given market. You need to look at the global market and you need to look at per-route fragmentation in this sense. There are models and complicated statistical methods to calculate quantities of how strong or weak competition is, which you don't do based just on on-time performance. I can assure you of that.