There's something wrong with his captures at 4K. The second part of his video is 1080p and 60fps, and I didn't come across any hitches or stutters during gameplay. I skimmed past the cutscenes because I don't want to spoil it.
Take a look: https://www.youtube.com/watch?v=GAwSNkIE4jA&app=desktop
60 fps? No in this video.