Using a Stick Blender with Vegan Cakes

[Annoying Twit]

Previously I had a lot of trouble with my vegan cakes falling in the middle. After trying this recipe, which worked well, I've adopted the technique of mixing the batter with a stick blender for two whole minutes. This produces an amazingly creamy batter, and whatever recipe I use it seems impervious to falling in the middle.

What is the blending doing to the batter that prevents it falling?