That's the line I often see on Twitter / Reddit and usually gets a lot of upvotes, despite being irrational, with no proof to back it up.
As bitcoin falls, the demand for Tethers goes up. To keep Tethers pegged to, say, $1 USD, they need issue more to meet the demand, which would be a more rational explanation why more were issued.
Or maybe people want USD, but the exchange forces them to go through Tether to get there. So there'll be a brief demand for Tethers, then a big selloff of Tether for USD.
Tether was kicked out of their HK and Taiwan banks, and now they are banking in Caribbean islands. They are supposedly holding $1.55 Billion USD cash in one of those banks to back USDT issued so far.
My question is, have you seen a Caribbean bank? Most bank HQs over there look like a 7-Eleven, and banks are owned by local politicians or shady characters. Anyone who deposits more than $1 million in those banks is a fool.