Peter's memories are in his body, but #700 explicitly showed that the golden Octobot was unable to physically connect with the body in order to transfer Peter's full imprint back in. Due to Spider-Ock's neck armor, the bot was only able to "wirelessly upload" Peter's memories.
That bot should still be out there, but now with no one's consciousness driving it since Peter-in-Ock is dead.
I see. So if Peter's consciousness is not in the bot, and not in his own body, it must logically be in Ock's body; thus, how could he possibly return? If Peter is trapped in Ock's body when it dies, then how can Peter do anything but die?
Having SpiderOck possess only Peter's memories
doesn't make him Peter, of course.