Martin definitely does not recommend 400-600g of carbohydrate on lifting days. He does not recommend a number. He simply advocates that lifting days are "low fat/higher carb" and off days are "moderate fat/lower carb" with protein being on the high end of moderate for all days.
What you eat strongly depends on your size, weight and goals. I usually eat around 300g of carbohydrate on a lift day and probably sit around 100g on days I don't lift, but YMMV. You have to find out what works for you. A 5'9" 160lb guy shouldn't be eating 600g of carbohydrate unless he's looking for a huge, fast bulk. Also, note that increasing carbs come at the expense of fat. Fat is recommended to be kept low on lifting days to keep calories in check, and when you eat a lot of carbohydrate you store the dietary fat as fat. If you're going to carb load, keep fats as low as possible.
Don't put your trust in anyone on this forum, including me. You are the key to your own success.