The requirement is to be able to hide the optional fields from that message.
Environment
Liferay DXP 2025.Q1+
Commerce
Resolution
You can set up the Language Override to ignore the initial text.
The hardcoded argument is represented by {0} in the language key, so as long as you change the original language value and do not include a {0} in the modified value, the hardcoded text ((sku, quantity, requestedDeliveryDate)) will not appear.