I work for Amazon, but not directly on web crawling.

Based on the internal information I have been able to gather, it is highly unlikely this is actually Amazon. Amazonbot is supposed to respect robots.txt and should always come from an Amazon-owned IP address (You can see verification steps here: https://developer.amazon.com/en/amazonbot).

I've forwarded this internally just in case there is some crazy internal team I'm not aware of pulling this stunt, but I would strongly suggest the author treats this traffic as malicious and lying about its user agent.