if you are induced to buying the property because there is security camera, then it is misleading advertisement.
But, if it doesnot make any different, whether there is security camera or not and you still want to buy the property and your decision is not based on security camera, then it is not misleading advertisement.
Just like the "wife biscuit"(老婆饼) example, your decision is to eat the biscuit whether you receive a wife or not. But, if you believe you will receive a wife by buying the biscuit, i think you can go to disputes tribunal and ask the referee to award you a wife from the biscuit seller.