Unfortunately I don’t have a copy of that content builder solution, so I don’t know for sure.
It is possible, that the content from the builder might be actually stored in a post meta field. One thing you could try is to search for ‘themify’ or ‘builder’ in the custom field section of the index table, to see if any related fields pop-up: https://i.imgur.com/PENOsy4.png
If so, then try choosing all those custom fields and re-creating the index table. If the content was stored in there, then it should very likely to be indexed.
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