A assumed that email sent to G Suites addresses was protected by DMARC. Am I (1) wrong, (2) was this email really sent from someone inside Amazon, or (3) is there some other explanation?
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In this case, it's DMARC for amazon.com that matters, since that's the domain that this email is (claiming to be) from.
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DMARC / DKIM / SPF policy for arstechnica.com is for emails sent from arstechnica.com. It's important to set that up even if you don't use a domain for email to prevent other people from using it. The domain that matters here is amazon.com though.
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I thought the whole reason admins chose to use G Suites is so they didn't have to do stuff like set up DMARC. Not so?
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For sending email, you definitely still need to set up DMARC / DKIM / SPF, but I assume G Suite makes that easy to do. You need to set this up for domains even if you never intend to use them to send email. I don't understand the claim it has to be set up to verify for receiving.