Conditional Logic ON Confirmation Page

Currently the confirmation text does not support conditional confirmation messages or conditional statements within the confirmation message. If you needed to do something more complex you would have to create your own custom confirmation page and configure Gravity Forms to redirect to that confirmation page. You could then pass the form field data to that confirmation page and use code to do whatever you want with it as far as conditionally displaying text based on field values.

You would have to know how to read and process query string values. You would create a custom page template that uses PHP to read the query string values and display data based on the values that are passed to it. You would then configure your Gravity Forms Confirmation so it uses the URL Redirect, enter the full HTTP URL to a page using your custom page template and then use the query string builder to pass form field values to this page.