There are three kinds of Confluence administrators: in order of power: confluence administrators, system adminisrators, and super users. What makes this confusing is that the last one is assigned in a different way from the first two.
You can designate a groups or individuals with either system administrator or confluence administrator rights, and add people to those groups. I believe out-of-the-box, the confluence-admins group has system administrator access, and there is no group with confluence administrator access. You can change which groups have which access on the Global Permissions page.
As I said, super users are different. A super user is a member of the (confusingly named) confluence-administrators group (which has nothing to do with the level of admin called "confluence administrator"). Those people are also system administrators, and with out-of-the-box Confluence the obvious way to make someone a system administrator is to put them into that group.
This page explains it all: https://confluence.atlassian.com/display/DOC/Global+Permissions+Overview. The facts in that document are correct if, frankly, more than a bit confusing. I haven't read it carefully lately, but I believe it could say more clearly that the "confluence-administrators" group, unlike other groups, is defined in the software, and you can't change this special quality it has of defining super users.
System administrators who are not in the confluence-administrators group wouldn't be able to see restricted content, but would, as Rodrigo says, have rights to remove the restrictions.
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