Earlier quoted context omitted.
https://tether.to/faqs/ > Unfortunately, Tether has decided to stop serving U.S. individual and corporate customers altogether. As of January 1, 2018, no issuance or redeeming services will be available to these users. Exceptions to these provisions may be made by Tether, in its sole discretion, for entities that are: Established or organized outside of the United States or its territorial or insular possessions; and…
So as source for the claim that you "can't redeem tether", you are linking to something that says you can redeem tether?
Tether, in its sole discretion, may choose to redeem tether, as long as you're a corporation with over 10m USDT incorporated outside the US.
I'd say that's not an ironclad guarantee that you can redeem tether.