1. Congrats for formalizing CFSG! Imo the importance here is that this is a blackbox result for which a mere "truth certificate" is intrinsically valuable and adds confidence to many results atop.
2. The biggest correction was of a wrong proof of UGT, which already had other proofs since then. I think this largely justifies the common wisdom "There are mistakes in the literature, but CFSG has long been proven."
The largest math proof in human history is now computer-verified.
Today, Axiom announces a complete Lean auto-formalization of the Classification of Finite Simple Groups, the "periodic table of symmetry."
About 15,000 pages, built by over 100 mathematicians across generations.