I write about his work on this website to bring notice to his work, because I don't believe Scholze and I'm not going to read Mochizuki (If I did, it would be his original actual contribution to algebraic geometry (and I don't know why I don't read Scholze but its scary mmkay)). So I mentioned that Joshi was from the IAS for the same reason, to convince my readers to read his work.

Further edit: I guess he's at Arizona right now, but he was at IAS at some point....