The speaker's concern is that indexes may be manipulable because many are based on very little data that has little correlation with the actual price of buying a new reserved contract.

“yes, um well our concern is there's a very similar problem, um where you can manipulate an index. Um our impression is why you can manipulate that index is because a lot of the indexes are based on a very small amount of data that has um”

“Not a lot of correlation with the actual price of buying a new reserved contract.”

“That's what we're concerned about.”