Can you open a new support ticket for this so that it can be directed to the developer https://support.advancedcustomfields.com/new-ticket/.
As a side note, their isn’t any documentation that I know of that tells you how fields are stored. The basic fields are easy to figure out, but things like repeaters and flex fields, not so easy to find information on. options with “options_” added to them confused me at first as well.
This is a pretty good post on the subject that I found the other day, although is was written before the term meta was added to ACF.
