Let's take the classical example of Alice and Bob with 0.5BTC each. Commitment Txs are exchanged for a new balance sheet: Alice has 0.6BTC, and Bob 0.4BTC.
If Alice loses Bob's Breach Remedy Tx, she can still publish a Commitment Tx and get her 0.6BTC, but if Bob acts maliciously, she is not able to defraud him. Is that correct?