I stand corrected. Regardless there’s still a lot of conjecture and not a lot proven about a lot of dietary things like keto and even fasting. But even leaving those aside, I personally can’t see why most cyclists would want to intentionally limit their growth by limit carbs. You may be happy tooling around at a low speed, but a lot of cyclists ultimately want to get faster. by being keto one is effectively capping how hard they can ride and eventually that limits any future improvement, because once one gets closer to threshold and above, the body needs glycogen to be able to fuel.