Yes that was the big point of that scene, the "Are they still alive?" question. Is he is talking about the rest of the Oceanic survivors, the Others and or the Freighter people?

Obviously the Oceanic 6 is hiding something and a ruse of some sort, the details of which we will find out this season I think. I was thinking that the O6 is hiding the fact that so many stayed on the island and are alive. Abbadon is digging at this possibility?