Interestingly, when researching this, I found the opposite - with the ChatGPT answer explaining that "The most common way to melt an egg is to heat it using a stove or microwave.", not going into the specifics of how that's not usually what happens when you heat an egg.

(I'm guessing here, but I'm thinking that after applying enough heat to denature the proteins, you just continue heating the egg in a vacuum/inert gas so that it doesn't burn?)