Hello, 

When a topic is visible, there is a lot of moderator actions available: 

When a topic has been deleted, but not yet permanently deleted, you can still visit the topic. 

In that case, the list of available options are fewer. This is fine, but you should still be able to view the Moderation History in my opinion.

(I was very tempted to report this as a bug, as I feel this is an oversight, but I have a feeling tier 1 would count it as feedback.) 

This was fixed for an upcoming release:)