Many customers on AWS have contracts that guarantee discounted rates given sufficient volume. People have commented on hn about negotiating them, and you can see some examples from recent IPO filings. Amazon (the non-AWS parts) are yet another customer of AWS, and wherever possible you should expect them to operate like one. They even buy RIs!
I think OP was asking if Amazon is calculating their savings based on the public AWS service pricing or their own cost for running on those AWS services (there's obviously a good chunk of margin on what it costs to run AWS and what the listed service prices are for those services).
I can't say either way, but they mention the average person saves even more than they do (90% vs the 60% Amazon saw). This was due to their Oracle license being much cheaper than normal Oracle customers. So if you extrapolate, even if they did get some discount being Amazon, the discount they were getting on Oracle probably makes the savings comparable to if they weren't getting large discounts on each side (regular customers of Amazon/Oracle).