Found through this: https://www.instagram.com/p/C8TzyPDiqjR/
I checked it out and he doesn't talk about Heartstopper, just generally about his job. I saved it just in case I find a use for anything he said here although he's pretty much said all the same stuff in other interviews before (but I think other aspects about his job might become relevant for season 3...). I put it in the s3 sources list. Funny how I didn't have a single video interview of him in season 1 days and now there are many to choose from! Of course he's more famous for other projects but he's definitely been getting more recognition for his work lately.