But this begets the question: How do we know that this system with Jeff Bezos is not already System A?

There are a lot of people who think they know what System A is and believe we are in System B but there's no lack of examples of people who get their chance to implement what they believe is System B and cause far more misery because they didn't know we were in System A (relatively speaking)

Personally, a system that generally rewards competency and is based on voluntary transactions to me is trending towards System A because people who amass power in such a system and maintain it generally do so because they are good at getting results through transactions that on the whole are generally voluntary and mutually beneficial.