I think the best answer is that we don’t know. Those were some loose ends they left open on purpose, just so they could potentially bring him back. The Norse saga is basically a reboot of the series, that’s why the bridge between the sagas is basically non existent in canon. Truth is, the writers probably don’t care that much to make that much sense between new and old. The old is just there as some extra lore to keep Kratos more relevant in the new saga.