Thank you for asking him, Cactu. Also, I think this whole discussion about if he used hitbox patch or not is stupid, really. First, most of these asian veterans play with everything on default. Second, he's been able to LNMNB fullcap on IN. Third, like IHNN said before, EoSD isn't that absurdly hard to perfect compared to the other games, but it's mostly about less people trying it (upon watching Miduki's 1MNB run, he actually died on Thousand Needle Mountain, which should be something trivial to them, but he got too nervous). Fourth, these veterans have a better idea of where the hitbox is than any of us (eg. Oosaka doesn't play with it, yet confidently made it through a wall from stage 6 Sakuya's nonspell while having spare bombs). Fifth, by that logic, every other player could have edited their games makes reducing the bullets' sprites to their hitboxes, or even used some sort of savestater as it'd be masked by the skill the already have (unlike the Goldenfox one). Still, I'll watch it in a while and pay some attention to his dodges.
EDIT: oh, so he admitted. Okay, that's better than taking any assumption. I'm going to add a note about it. But could you show where he said so?
EDIT2: okay, I just watched stage 6 and stage 4 up to books with the hitbox patch, and have to admit this is kind of an unnatural replay. He does seem to "know too well" where his hitbox is (mostly by making it through a wall on Vampire Illusion), and the way he moves kinda weird, similarly to Aqura, who seems to play on a Saturn controller instead. But it's unlikely he used any other sort of tool assistance.