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Oh sorry, I misread and thought you had posted the book and it was on hold for another member.
No, the books that are on your wish list which are on hold are invisible to other members. You can verify this by putting some books on hold and then going to your My Account page. There's a My Profile button on the right just below the Need Help link. Click that and then select the Wish List tab. That's how your wish list looks to everyone else.