Basic import question

Hi, with reference to https://wpgeodirectory.com/support/topic/import-errors-2/

Are you saying that even if an administrator intends to choose the “Update listing if post with post_id already exists” import option with the intent to only amend ***a single column*** in the Geodirectory database with updated data records – then ***all the GeoDirectory mandatory fields*** are required again and again, even on all future file import updates – despite being correct already in the database – even if we only ever wish to update a single column repeatedly (e.g. only post_id as the identifier column)?