I've watched people live coding audio software. That's a performance, like jamming or rap battling where you make music spontaneously for an audience. It's a distinct skill from being able to polish stuff in a studio, just like playing a guitar or singing live is a distinct skill, it's even distinct from working with a loop sampler (like Marc Rebillet) although it's often related.

But for a compiler, what's "live"? Somebody writes some code and you... tokenize it in real time, transform it into some intermediate representation, optimise that and then spit out machine code? No? Then it's not "live coding", you're just talking about how he got paid to stream on Twitch or whatever. Loads of people do that. Ketroc streamed his last minute strategies for the recent SC2 AI tournament, he's not even a "professional" programmer, half his audience haven't seen Java before.