U.S. user data stored on Amazon Web Services servers.

What data?

https://www.tp-link.com/us/about-us/privacy/

His statement read like a generic one, so it likely includes all US user data (e.g., configs for their smart switches, videos from their cameras, support cases/interactions, and all sorts of other non-router related stuff).

TP-Link Privacy Policy - Terms of Use

The TP-Link Privacy Policy and Terms of Use provides a plethora of information for visitors