You have to account for those change in your import configuration. Instead of mapping the is_position property, you have to account for it in the organization_unit_type_id field. And instead of setting active to true, you you have to set the state_id to 1 and instead of setting active to false, you have to set the state_id to 2. There are checks that will be performed upon the execution, so you will be notified if you missed any of those changes.