I would love to listen in on those negotiations. If you’re reading this, and Twitter wants you back, I hope you ask for a contract with a year’s pay in advance, due before returning to work, at 10x your prior rate. After all, you must be one of those 10x developers if Elon is willing to eat crow and ask you to come back.
Being asked to go back just means it's cheaper to get you to return than it is to recruit someone to do your old job.
For software, the existing employees will always be cheaper. It has been argued that an engineers value is captured most in their mental model of the system. EG: Want a new feature in a system I built and maintained? Boom, here are the touch points, the gotchyas, and here is the roadmap to get if done in three days. Anyone new to that system will first say, cool, give me about 3 weeks to learn this code, and then maybe another 7 while we implement it and work through all of the trip wires we did not know about.