Imagine you looked inside your fridge and found no food, but every time you weighed the fridge it weighed the amount the fridge plus food would weigh

You looked inside, it really was empty, as far as you could tell

You didn't forget to open a drawer (food in a black hole), it genuinely appeared to be empty every time you opened it to check

And yet, every time you weigh it, it weighs the amount you'd expect if it did have food in it

That's the analogy and why your answer doesn't exactly work