Joel's medical condition in the HBO show is actually canon thanks

The Last of Us game addresses the issue from episode 6 in a very subtle way

Why Was Olivia Rodrigo Singing About Billy Joel? - The New York Times

Joel immediately got soft in Jackson - A complete character assassination with show Joel being the exact opposite of what he was portrayed in the first game where he was a badass

The Last of Us fans distraught at Ellie and Riley's tragic romance

Joel Miller, The Last of Us Wiki

I have read and seen some reviews of the HBO show and it seems this is already canon. They've made Joel a nasty person. : r/TheLastOfUs2

Fall Magazine 2022 by Brimmer and May School - Issuu

The Last of Us: Joel's medical condition in the HBO series is canon thanks to TLOU: Part 1

The Last of Us HBO Episode 6: What Is Wrong With Joel, Is He Sick? - GameRevolution

Joel Is Already A More Sympathetic Character In The HBO Version Of The Last Of Us