Really not that hard to believe. That 2008 loss haunted him for a long time. The effects of that loss was felt all the way til AO 2009. It was a huge heartbreak that derailed his confidence against Rafa. 2019 was not like that. He could shake off that loss and then bludgeon Djokovic in their next encounter almost like W 2019 never happened. It was a disappointing loss, sure, but it wasn't a prolonged heartbreak for Federer. Fed knew it was a choke job unlike 2008 which was a legit barnburner.I have a hard time believing he actually considers 2008 more heartbreaking than 2019.