No idea if this is worth the paper it is written on but Stuart Hoegner posted this on Twitter:
https://tether.to/wp-content/uploads/2021/04/tether-assuranc...
https://tether.to/wp-content/uploads/2021/04/tether-assuranc...
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"