Can I beat Fire Emblem Echoes hardest challenge run?

This is a video explaining the routing and idea behind completing one of the most difficult challenges Fire Emblem has to offer: The Shadows of Valentia HM Ironman Blitzkrieg run, where I cannot use the turnwheel and must complete the game in less than 500 turns. I also added the caveat of no DLC and no retreat (to avoid trivializing some of the harder chapters). This video will cover the aspects of planning your run, the optimal uses and characters utilized, along with the efficiency strategies and meta discussion of SoV. Unfortunately, due to the sheer size of the ACTUAL recorded run, I couldn't get it to fit even in a google drive after compressing it at 3 times the speed. However, if anybody wants to see it, I can personally send the files or figure out a way to do so. What do you think? Is this INDEED the hardest challenge run ever? Do you think another challenge run is harder? Have you completed this run? If so, please let me know down below in the comments.