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Reviewer note: The Speaker field names the party that acted. The timing and the amount are as stated by Hacken, not by Tether. Hacken adds that another count dates the first freezes at 21:14.
The most likely explanation is that the attacker gained the ability to make Binance's hot wallet signing system sign transactions of its choosing across chains.
Binance says it found no evidence that a private key leaked, while investigators say Binance's signing system signed for the attacker, and the two statements can both be true.