I'm not quite sure what you're asking about. I'm saying that we can't yet take the Wiles and Taylor-Wiles proof of Fermat's Last Theorem, feed it into a machine, and get a Lean proof of Fermat's Last Theorem.
I remember asking Bob Solovay whether he thought Wiles' proof of FLT was within reach of formalization and he said something like: it is probably 20 years away. It may have been 20 years since I asked him that, and seeing this recent work with Lean makes me think FLT might also be doable, which would make Solovay's guess just about spot on.
