The solution outlined above works for all Discourse forums. Whereas the AI functionalities integrated in Discourse are only available if the plug-in is installed.
The quality of the AI response depends heavily on the prompt entered. And even then, the response (e. g. a summary) can be unbalanced.
Use case: Once a topic has been completed, a summary may be desirable. For example, as the last post on the topic. However, this should first be edited and recognized as a consensus.