From the article:
The liberal comedian then asked Fetterman whether his shift in various policies had anything to do with his recovery from his 2022 stroke, asking if his near-death experience had given him a “freedom.”
“Absolutely,” Fetterman responded. “There’s a line from the first ‘Batman,’ Joker’s like ‘I’ve been dead once already. It’s very liberating.'”
“It’s freeing in a way. And I just think after beating all of that, I just really [want to] be able to say the things that I have to really believe in and not be afraid of if there’s any kind of blowback.”
So basically yes, the stroke made him a Republican. Pathetic and disappointing, but all too predictable.
Google told me he was on a show called Where We Call Home. Specifically on the 8th episode of the 1st season.