https://wow.gamepedia.com/Yogg-Saron
status: Active (lore), as i said in my post, all we did was essentially kill a 'manifestation' of them, both c'thun and yogg, they are in their prisons regenerating and scheming to retake the surface when the time is right, i'll use a starcraft analogy to explain it so you and others can understand, the old gods and void lords are basically Amon, they may be 'killed' in our reality, but they are immortal eternal beings of the void, all we do is destroy their corporeal forms, they can never be truly killed, and as such they are very much 'alive' and waiting for the right time to strike again covering the world in darkness and corruption.