How should I disclose a data extraction error when submitting a revision?
It is probably better to point it out. A note to the editors/reviewers is fine. You and everyone want the best science to be published. Full disclosure is best.
I doubt that this would lessen the chance of acceptance, but it might draw a bit more scrutiny overall. But that is a good thing in general.
This is similar to pointing out other changes in the paper, those that were called for and those that you think are relevant to improving the paper.