Why would you trust anyone else more? They'd be doing the same exact job for Amazon as Carney is (even if it differs slightly in the implementation). It's just deliciously transparent when they hire Carney to do it.
Any other person would be bullshit artist too, Carney is just known for delivering bullshit. If someone sees a name on Amazon's PR mouthpiece and doesn't immediately drop their evaluation of that person's statements to Carney's level, they're simply being tricked.
Although I do think it is heavily colored by survivor/leader bias in the same way that Bezos "I don't recognize" response was. And that there are "good groups" within the company and that senior developers and their teams are more likely to be treated well than those who are essentially purchasing agents and vendor managers on the pure retail logistics/ops side of the company, where skills are not compensated as highly or as difficult to find in the employment market.