FFXV - OoB 24 - Ch14 God Mode / Armiger Glitch

Finally got to Ch 14 (still in the Past), with Young Party. The video shows how to get OoB during Ardyn 1, and hold on to the Armiger gained in Phase 2.
Being v1.0, if you venture too close to the Rest area, the battle will end (score on screen), and Ardyn is no longer aggressive. So instead, we must push him towards the bed area. Greatswords work fine. There is no easy visual cue, but getting him somewhere between 55-65% health will trigger his phase 2 cutscene. To be safe, every hit after the Axe Conqueror, Stay and see if the cutscene plays. If after 10 sec it doesn't, hit Ardyn again and repeat (him recoiling delays the cutscene beginning enough to let you select X on the bed).
Once you choose Yes while the swords are spinning around Noctis, you'll have triggered the glitch. The game will auto move you around the arena now, as if you were in Phase 2, but with no boss to target. There is no escape here, so simply load the autosave. Now you have Armiger, just like from escaping Ch 9. You can proceed to go to Past Altissia, and explore there and Lucis.
Sadly, there is still no way to trigger the endgame from this state. Ardyn is gone.