Do we also see the log for the following:
1. If a user delete his own post
No, it is not recorded in modlog.
2. In a self moderated topic if the topic creator delete a post
No, it is not recorded in modlog, but it is displayed on the top of the thread about how many replies are deleted from the thread until if it's self moderated.
The only way to trace back the deleted posts you tagged for is if someone have
archived it. But chances are low if you personal have not done that.