In an enthusiastic tone of an AI enthusiast: Thankfully, now that we have ChatGPT, this feature is obsolete and the curl executable doesn't have to contain half-baked quines in it anymore!
I'd never change --libcurl and gengetopt[0] with some output from some artificial thingy which babbles semi-truths which doesn't understand what it's doing.
They are deterministic tools which does what you want in a battle tested way, and will let me sleep well at night, which is an underappreciated feature of mature programs.
A code generator needs neither hundreds of GPUs nor an internet access to work. Not having to train a code generator in ethically questionable ways is also a huge plus, too.