Hello Shane, Thank you for reaching out to us.
Please understand that we use WooCommerce coding flow for the import/export module. Therefore, when vendors export and import a variable product using the module,all details of the variable product are transferred, except for the variations linked to the attributes. Vendors will need to manually add these variations after importing a product.
This is all carried by WooCommerce code itself.
As WooCommerce itself has issues with this, hence the vendor is facing the same. We will keep checking whether WooCommerce will release any update on this and will keep you posted. You can also keep track of the issue from the WooCommerce support forum here https://wordpress.org/support/topic/import-of-variable-product-is-not-working/.
Please feel free to reach out if you require further assistance from our end.