I think there are some intentional reasons it sounds that way, but I think there are also some incidental reasons: The reverb in that venue is crazy - it really jumps out at me how much it sort of resolves to a tone of its own, which has to sometimes be dissonant with what’s being by played / sung. So what you’re hearing isn’t always in tune. Additionally, this is an expressive performance, so between the echo and the interpretative approach to the meter, what you’re hearing isn’t always in time either.