How did you get here? The chu boost? If so, this would still work all you'd need is Din's Fire to actually load that lower part.
i think what he means is that he went to the edge of the wall and had the camera clip OoB which happens often in just normal play. but even if you cant physically see anything, the loading zone could theoretically still be there (like when you clip Botw), even if it has no textures associated with it. (if the floor geometry is gone, maybe you could get as high/close as you could on top of the map/wall and do a megaflip into the loading zone).
also have you tried BoTW early? an easy way to do it without isg is hit the cucco 3 times. pick it up and align yourself so a backflip will put you in the well, then shield drop, slash the cucco, and backflip in quick succession. better yet, when you are young link and the cutscene for cucco's start attacking, is link floating like in normal game?
