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[JammyDodger]

The 7-day timer is just a default. The feature of deleting the residual topic stubs was added in last year:

@jomaxro

Automatically delete stub topics after the entire topic is merged into another topic

When an entire topic is merged to another, a “stub” is left, with just the first post and a message that the topic was moved. These stub topics will now be automatically deleted, 7 days after merged. Admins can modify this via the delete merged stub topics after days site setting.

You can delete them straight away manually, or edit the delete merged stub topics after days admin setting, depending on what works best for you.