When contacted for a statement, an Apple spokesperson told Ars:

Apple Intelligence is designed to help users get everyday tasks done faster and more easily. This includes optional notification summaries, which provide users who choose to opt in a way to briefly view information from apps and tap into the full details whenever they choose. These are identified by a summarization icon, and the original content is a quick tap away. Apple Intelligence features are in beta and we are continuously making improvements with the help of user feedback. A software update in the coming weeks will further clarify when the text being displayed is summarization provided by Apple Intelligence. We encourage users to report a concern if they view an unexpected notification summary.

Gonna need a lot more than a subtle icon change to clean up this mess.