Sent TRX via off-chain transfer, recipient says he never got it — how do off-chain transfers actually get disputed/verified?

Made a withdrawal of 909 TRX to a TRC20 handle, off-chain switch, exhibits "Completed," 0 payment. [Screenshot attached]

Recipient's discover stated USDT-TRC20 only, warned different belongings "may be lost." I mistakenly despatched TRX as an alternative of USDT. He's saying he acquired nothing.

Because it went off-chain, I'm assuming that handle is a Binance account — so shouldn't the TRX nonetheless be sitting there as an asset, simply not the foreign money he needed? Or can a wrong-asset off-chain deposit truly go missing/unrecoverable like their discover claims?

Curious if anyone's handled this actual state of affairs.

Edit:

I received in touch with binance help they usually also confirmed that the recipient is a binance account and the transaction was profitable.