Bitfinex has confirmed its loan repayment to Tether. Stuart Hoegner, General Counsel at Bitfinex, said:
"Bitfinex is happy to announce that in January it repaid the remaining balance of $550,000,000 of the outstanding revolving loan facility to Tether. Bitfinex made this payment in fiat currency wired to Tether's bank account. The loan has now been repaid early and in full and the line of credit has been cancelled."