I didn't want the video bad enough to load it.
Yes, he must have been fasting, or there would be no point in that kind of test. We normally check with a glucometer two hours after eating, at which point it is on it's way back down. Trying to catch blood sugar at the very top of the spike would involve measured dose and a stopwatch. Not practical for most of us, and if you use the two hour standard, you will get consistant results.
A big serving of salmon by itself isn't going to be significant to blood sugar. Carbohydrates are the main source of blood sugar. Granted, fats and protein will partially metabolize to sugar, but it's hard to imagine it becoming a problem.