As describe by Ole, it is not possible for you to retrict a meber of confluence-administrators group to access the page. Mentioned by our documentation here, member of confluence-administrators group is a super user which will bypass any space permission.
However, if a page is restricted, the member of this group won't be able to access the page (hidden) without knowing the direct URL to the page as describe here.
Hope it clarify your doubts.
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG