I agree that you should get rid of this guy, or as Ldavis24 said, maybe just disregard his advice on nutrition if you really trust him on other subjects. (I have a very crunchy, BF-friendly, vax-delaying and selecting ped who still told me to give rice cereal and to turn him forward-facing in the car at 29 inches.

) Not just because of his attitude towards breastfeeding, but also because he seems to think that all infants are the same and whatever it says in the book is what you should be doing with your baby. A dangerous attitude. You and I and everyone who knows anything knows that everybaby is different.
I, for one, still provide breastmilk to my 10-month-old (today!) son as the main staple of his diet. He nurses right before bed and nap, he nurses right after waking up in the morning, and I usually nurse him right before he eats his solid foods. We dutifully started him on solids when he was 6 months old, but just a little bit now and then for fun. That was fine for him for a couple of months, then he suddenly took to food with wild abandon! Now in addition to all the nursing, he eats ridiculously huge portions of just barely mashed peas, sweet potatoes, several types of squash, spinach, green beans, lentils, and fresh fruit. Very teensy amounts of whole grains and oats. No meat, no milk other than mine.
Before I started letting him eat huge meals in addition to nursing, he was on the boob ALL DAY and he was a cranky basket case half the time and he wouldn't sleep. Copious amounts of food have helped with this, but I never let anyone tell me he doesn't still need the boob. And when he's sick or just going through some kind of a phase, sometimes he goes almost entirely back to the boob for days. He's 10 months old, 30 inches tall and 20 lbs!
Everybaby's different. You do what your baby needs!