Please note that the screenshot shows a vendor block, which does not relate to listing import. That is, you import the listing attributes that you create in Listings > Attributes, and the vendor block will display all the information that you create in Vendors > Attributes, and then fill in these attributes when creating a vendor.
I thought the vendor content was tied to the user creating the listing?
Let me ask the question differently. if I do a bulk listing import as an admin of the site, and don’t provide any vendor info, what will display in the vendor section? What would it look like after the import?