alternate app icon & product page optimization

Hi,

I'm considering trying the product page optimization with other app icons. The doc says that " If an app is downloaded from a product page with a test treatment, the test treatment app icon displays throughout the download process and on the user’s device." (https://developer.apple.com/help/app-store-connect/create-product-page-optimization-tests/configure-test-treatments).

Do I understand correctly that no additional code is required when the app is downloaded from the test treatment ? No code required on app launch ?

I appreciate any feedbacks, Thank you