The user account is not deleted, it's deactivated i.e. the User Status is set to Blocked. As you can see, the Super User last used in September 2023 in your screenshot is indeed deactivated (in the Enabled column is a grey X, meaning the user is blocked). The other two temporary Super User accounts were last used on January 2nd and 5th, therefore I assume they are still in use and not expired.
The only thing that is deleted is the Temporary Super User entry from Admin Tools' #__admintools_tempsupers
table. This is why you no longer see these users in Admin Tools' Temporary Super Users list.
Nicholas K. Dionysopoulos
Lead Developer and Director
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