Okay, that I could understand. Well, not the whole thing about saying bunnies and rabbits are different (unless they meant bunnies as babies, but that still does not make sense since babies should have restricted veggies). Not all rabbits can handle a lot of veggies, and certainly not all of the recommended veggies can be tolerated by every rabbit. A lot of rabbits have problems with broccoli, yet it is recommended by the House Rabbit Society. Veggies, like any new part of the diet, should always be introduced slowly, and one type at a time.
Personally, I feel that 2 cups of veggies is too much for a lot of rabbits. Some rabbits can handle it, but I have seen many, even ones that were used to the veggies, have problems with it. Each rabbit is an individual, and each one can handle different things and needs different levels of nutrition. Also, 2 cups of veggies along with the needed amount of pellets is just too much intake for a lot of rabbits. They can either get overweight or just not eat it all (meaning they will just pick out their fave foods and won't get a balanced diet).
Also, the HRS DOES recommend feeding pellets at about 1/4 to 1/2 cup per 6 pounds, which is, to be honest, right along the same lines that a breeder feeds. Which begs the question as to why HRS people are often saying that breeders feed way too many pellets, and why breeders say HRS people feed way too few pellets.
Are you feeding any pellets at all? If you are worried about high calcium levels and your bunny being overweight, use timothy pellets rather than alfalfa pellets, but the pellets are important. They contain a balanced mix of the minerals and nutrients needed that might not always be found in the veggies and hay. I feed pellets in the morning and veggies at night, with hay all the time. That way they are hungry for the pellets, and eat their fill of that, then they get their veggies at night so they have had time to get room in their stomachs, but are not so hungry that they go crazy and eat too many of the veggies too fast and get sick. Plus, I have found if I feed the veggies and the pellets at the same time, they just pick out the veggies and ignore the pellets; like a little kid that would rather eat candy than a balanced breakfast. LOL. Though I have had several through the years that have preferred pellets to most veggies.