I have already explained this. As I said explicitly, “To pre-exilic Hebrews, resurrection was the only way out of the grave (see the miracles of Elijah and Elisha, as well as the texts in Isaiah and Jeremiah)”. This is why we find resurrection expressed as the future hope of the righteous, in the other books I cited, and that is evidence for an eschatological resurrection.
You keep trying to represent this as something I have made up, but I have already pointed out you can find it in mainstream scholarly literature. There is evidence for a belief in pre-exilic general resurrection as early as the seventh century at the latest.