Edit: I noticed you edited your comment above with some details. It seems that he used GPT-3 just to create the SQL statement which was then executed locally. So GPT-3 never had the actual data set, just a prompt that included some details of the schema.
As a result I think any sort of "success" here is fairly limited when GPT-3 is blind to the actual data and has limited knowledge of the schema to be able to formulate queries that imply some knowledge of the data.