This is nothing more than FUD designed to benefit a short position. The reason why exchanges like Binance and Bybit have their inflows from Tether... is because (as the author explains) they only take Tether!
Why do they only take Tether? Because US banking is incredibly expensive and a regulatory nightmare.
Why do people use Tether exchanges, over Coinbase? Not just because of leverage, but also because many do not AML/KYC, especially if you only deal with crypto. A LOT of people in the crypto community don't like to pay taxes, and we've known this from day one.
Many crypto enthusiasts also boycott "regulated" exchanges like Coinbase, because they shut down accounts if you use it to gamble on a sportsbook, or whatever their surveillance doesn't like.
So it should not be a surprise that many people in the crypto community, me being one of them, actually prefer to use Tether and Tether exchanges.