In gravity form settings, there are two kind of confirmations, first is redirect url and second is text. You can either redirect user to another page like thank you page after form submission or you can show the confirmation text like thank you, your form is submitted successfully.
For the redirect setting, we can use there form field values also, to set string etc, but we can’t set there completely dynamic url on based of conditions. For example, I have used Post fields in my gravity form, from which post creates automatically after submitting the form. Now, if I want ti redirect my user to the newly created post which is just created by him by submitting the form, then I cannot do it via Form settings.