From my understanding Dr.B's reasoning for not liking pumps is the damage to the tissue that takes place at the infusion site. The idea is with shots, you have more available places to use for injections.
My second thought, is that your Ophthalmologist is a retina specialist and while I'm sure he/she sees a good number of PWD, I would seek advice from your son's endo about appropriate action regarding BG control. Also he is most likely honeymooning still which should be taken into consideration.
That said, I use a pump with Dr. Bs diet. I debate constantly with myself about it's usage, but it allows for many small boluses and boluses over time which are nice. Otherwise, there isn't much issue other than the "real estate" factor.
Good catch on the Dr. B diet. I've been a T1D for 27 years and that is the only way I've found to have any sort of good control.