Yes, in the admin interface, they can see that the board exists, as they may need to administrate it.
They do not get access to use it unless the permissions for it explicitly inclues them though. Just because they're an admin doesn't mean they should see a board when they're using the system as though they're a standard user.
So you’re using Trello at work, at home and to track your new DIY crafts. The family and co-workers are all on board and everything is organized, color coded and has a due date. But still, there’s so...
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