Hi there,
We decided not to implement export this particular column. The reason for this is that this column has a lot of aggregated data that is also displayed in HTML. Exporting this to CSV would not be very useful in most spreadsheet programs. A besides that, separate columns for each product info would be better than 1 column that has all the information.
But if you want to export this column and use the actual data, you could have a look at this filter.
https://www.admincolumns.com/documentation/filter-reference/acp-export-value/
You can check for the Produce Detail column and just return $column->get_value( $post_id ) as value. Or you could implement your own logic to get a better value for your purpose.