He said "Did it work?". The mission was a suicide mission. All the X-men went on it knowing that they were all likely not going to return alive. When Scott woke up from the egg, he was aware that he had died and was asking Xavier if that mission was a success. Like if you wake up from a resurrection egg, its obvious that you have died. There was no indication that he remembered dying. Even if you were confused when reading that issue, X-men #6 clarified what exactly happened
Theres nothing ambigous about this. The X-men dont recall what happened on the mission bc Xavier backed them up right before they left, when they were within the reach of Cerebro