The curve goes up to 150g, and you can still meet that number without eating grains. To clarify, grains are a carbohydrate, but one we are avoiding here, obviously. There are other foods that both contain or are primarily carbohydrates, but are NOT made of wheat or wheat products, and can be eaten while following this plan.
"Primal-safe" carbs: Veggies, fruits, starches (sweet potatoes, squash, potatoes, rice if tolerated), also chocolate, dairy.
Recomp is short for recomposition, which is basically staying at the same weight but you could be losing fat and gaining muscle. Weight stays the same, but your body composition is different.