I agree it is a bit surprising:
The key here though is that the post we create is a real post with real markdown.
This means you can remove it if you don’t want the link around, add a whisper and so on.
I would say it is up to the operator to decide what to do here. That said I am open to having a Contribute > Feature request here that improves default usability.
- IF a topic is split
- AND the people who can view destination topics <> people who can view source topic
- THEN
- Add a whisper explaining where topic moved
- In the public post only mention that it was split, not where it was split
It is a rather complicated feature to build for a tiny edge case though.

