O ataque furtivo funciona contra um inimigo invisível?

Ataque furtivo diz (PHB p.96):

You don't need advantage on the attack roll if another enemy of the target is within 5 feet of it, that enemy isn't incapacitated, and you don't have disadvantage on the attack roll. So, as described you cannot sneak attack.

No entanto, vantagem e desvantagem diz (PHB p.173):

If circumstances cause a roll to have both advantage and disadvantage, you are considered to have neither of them, and you roll one d20. This is true even if multiple circumstances impose disadvantage and only one grants advantage or vice versa. In such a situation, you have neither advantage nor disadvantage.

Ataque furtivo afirma especificamente:

You don't need advantage on the attack roll if another enemy of the target is within 5 feet of it, that enemy isn't incapacitated, and you don't have disadvantage on the attack roll. (PHB p.96, emphasis mine)

Se você tem uma desvantagem na jogada de ataque, então você não pode Sneak Attack.