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Reviewer note: Event time is a date only. The 00:00 UTC time shown is a placeholder, the source gives no time of day. Hacken gives a range, shown here as its two end values. The source Hacken links for the range is Elliptic.
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.