Not sure why this is being downvoted, bodybuilders do eat carbs - they just time them appropriately. If you're about to work out, carbohydrates will help you get through it. On the other hand, if you're going to be sedentary for a while, or you're really trying to prioritize fat loss, you probably wouldn't eat as many carbs.

Of course, Keto is a thing, but I haven't heard many stories of bodybuilders that actually target the keto-state. It's about getting the right amount of carbohydrates (hint: not as much as most people eat).