Yes, the Vitamix A2300 is more than capable of making hot soup. One of the reasons this model is ideal for making hot liquids is the insulated container which ensures your soup or sauce stays warm for a long time.
You also have the hardened stainless-steel blades which spin fast enough due to the 2.2 HP motor that it generates a lot of friction and warms the ingredients while blending them. This can make for perfectly hot and smooth soups.