On the one hand, airports need to make money, and with people buying cheap airline tickets, airports have found a solution by turning themselves halfway into malls, and charging businesses extremely high levels of rent, which the airport justifies because it's a captive audience that can't go anywhere else. Most of the $15 sandwich is ultimately going to the airport as rent, not to the CIBO food vendor as profit.
But at the same time, there's public outcry over the absurd pricing, so the airport has to mollify lawmakers by insisting it'll come up with a policy where they won't charge more than 10% for what would be comparable in Midtown. The airport is trying to blame those greedy vendors! But this is a trick. Who could ever define that? Sure you can compare Starbucks with Starbucks... but you can't compare a CIBO sandwich because it doesn't exist outside of airports, which is by design. That's the whole point, that easy comparables don't exist, and when a journalist tries to use a FOIA request to get at the comparables, they're stonewalled.
The airport is trying to insist it's preventing jacked-up prices, when in reality it's the airport charging rent that generates those jacked-up prices in the first place, and it tries to pretend like it plays no part. Evil, but clever.