I found that most of the latency in networked audio applications, when jamming within 800 km within domestic internet, mostly comes from (a) a large network buffer (to prevent sound stutter when the network isn’t reliable, e.g. due to wi-fi interference) and (b) extra audio processing on top (echo cancellation, noise suppression), and not the limitation of light speed.
You're vastly exaggerating. FTL communication is not here yet.
The theoretical limit for half the planet is ~67ms, in practice it's north of 100ms for Jamulus (plus the additional delay of a user's sound reproduction system).
I believe the example above is more about sound speed than light speed.
I experienced concerts in stadiums, in the back rows, where the distance from the stage makes the sounds arrive noticeably later than the visuals.
The delay is really perceptible, and disturbing, to a point.
A TV audience would not suffer from it (assuming a live broadcast, with negligible broadcast latency, for the example to make sense).
It's pretty wild to think about. My dad used to point out to me that, if I was watching a live concert on the TV, the sound would reach me before it reached much of the live audience.