That makes a lot of sense to me. The reason I thought of them as Nucleation points is because they are able to draw the carbon dioxide out of the diet Pepsi (much like mentos but at a much much MUCH slower rate. I tried to include a video of this, but could not) when the diet Pepsi is in contact...
I have found some odd Nucleation points that appear inside of the top area of a bottle of Diet Pepsi (the area right near the cap as shown in pictures below). The nucleation sites appear either as soon as you open the bottle, or after the first drink (I will test this once more and see exactly...