Hi! Thanks for commenting.
The interview was conducted through an interpreter, with me speaking in English, and Yamada-san in Japanese. I still have my original questions and the interpreter's translation of their answers, which I've made available
here (do let me know if there are any access issues). For that particular question, I specifically sought to retain as much of Yamada's answer as possible, but here is the excerpt from my notes:
I don't have the Japanese language skills myself to transcribe Yamada's answers in their Japanese. I should still have the original recording somewhere, but I'm not sure if I'm allowed to release it. Interviews are typically arranged with the format of the published piece agreed in advance, and Japanese licensors can be quite strict in particular. I'll have to check on that.