Are names of reviewers visible to authors?

Can authors see the names of the reviewers?

The reviewers’ names are not revealed to the authors.

However, if the author is also ConfTool Admin or Chair, the user has access to the reviewer names (as these persons have access to all reviewers anyway).

You can test it when you log in as a "normal" author.
Please go to the list of users and in the column "Action" click on "Login as".

Exception: If you use the “Open Review” setting of ConfTool Pro, you can optionally display the reviewers' names to the authors (if required), but for the open review process all submissions and reviews are open to the public anyway.

You can find more information here:
Open Review Process: All users shall be able to access and review all papers