Would this insulin response be detectable with a CGM?

The answer is no - sucralose, saccharin, aspartame; it doesn’t matter, diet soda and artificial sweetener does not affect blood sugar in any detectable way, at least for me. It was one of the first things I checked when I got my CGM.

“It will crash your blood sugar” and “it will spike your blood sugar despite not having carbohydrates” are myths.