I don't think holding the current state of the project to a version of the README from three years ago is even remotely anywhere near a good faith comparison.
If it’s a mistake, then it’s in good faith, right? Maybe the README no longer literally says “learning Rust as I go along”, but it definitely did in the one I looked at quickly (yes, from tromp’s comment)
That said... is it really “really real” if it’s still experimental 3 years later?