If this is really the case, shouldn't it be worded as "most traded cryptocurrency" rather than "most widely used cryptocurrency"? Because as far as I know, though Tether is being widely traded for sure, not only for BTC, but for other alts, but I'm pretty sure Tether is very rarely being used as a method of payment and as a store of value, which actually people use bitcoin for. There's a quite significant difference between "most widely used" and "most widely traded". It really depends on user intent.
It is being used as a store of value as far as I know. People do use it as storing their funds in times of bear run when they expect prices to be driven down. Usage here is a dubious word. Usage can be taken in two senses, but i agree with you Cryptocurrencies are currencies which mean that they should be used as an medium of exchange so in literal sense usage in case of Cryptocurrencies should be determined by transactions only so yes Bitcoin is still the leader. But i think people still store a hell lot of money in USDT to protect themselves from volatility of market.
