I agree there is a lot of deceptive practice engaged in in the hair transplant business. That said, I still think this result is on the lower end of what should be expected. But he still has time to grow.
What is more annoying is the playing around with photos to make them look better. Dr.Charles did not do that here, but other doctors do it regularly. Example- before photo from the front is bright and shows the head tilted downward. Then the after photo is darker with the head tilted upward.
Or, the hair is wet in the before with no combing over and then dry with a lot of comb over in the after.