That's true, it is a digital currency and not fiat currency. So one can't withdraw a digital currency, but can only withdraw a fiat currency. With Bitcoin ATM you can only convert your coins to fiat currency and withdraw it.You can't withdraw Bitcoin as it is because it's just a digital currency not a real currency so the question of being able to withdraw Bitcoin is not possible.
You can withdraw Bitcoin in our normal fiat currency because it's a physical currency.