I don't think that a documented, reproducible very high blood sugar spike is nitpicking. I personally think it is reason for concern.
But you are absolutely correct, a sandwich is more than that. The author acknowledges this as well. It would be a fun thing to measure your blood glucose against (as I intend to). From an armchair perspective, the other ingredients in the sandwich may slow down the glucose dump into your bloodstream, but it will likely still dump the same amount, because the bread is still present. Along with the fat storage mechanism that glucose > insulin turns on, the extra ingredients may be more likely to be stored as fat.
I'll respond to this as soon as I complete the experiment!
