>"Our opinion is limited solely to the CRR and the corresponding consolidated total assets and consolidated total liabilities as of 31 March 2021"

IOW, "They have the total amount of CP, loans, and bonds they say they have. Whether or not the issuers of those IOUs is Bitfinex or some shell company connected to the owners of Tether we have no opinion on"

Tether has repeatedly lied about their reserves. There is zero reason to take any claim they make at face value.