I did get the feeling that the guy was pretty smart and he did seem to know quite a bit about FAST systems as well as most other efi setups.
The confusion may have been due to the fact that we'd upgraded our system from the EZ 2.0 to the Sportsman edition. Either he hasn't touched one of these Sportsman editions before or no one had passed the information on to him that we'd replaced the ECU. Either way, he must have ignored the paperwork we left.
I've known some experts before that had a tendency to stretch the truth about things. This is the guy that will be figuring out the final bill for the work so I'm not going to risk upsetting him by inferring we think he might not be being straight with us. - And as I said before, someone else at the shop may have tinkered with the car before he got to it.