Still traceable. I still know that both new addresses had coins sent to them from a "known" owners address.
And it's the same with Litecoin!
Frank and Helen want to break the chain of ownership. Frank controls address A with money and a new address C. Helen controls address B with money and a new address D.
Whether they're trading bitcoins for bitcoins, litecoins, BBQCoins, colored coins on the Bitcoin network,
whatever, as long as they're both objects on a public blockchain, the information possessed by an attacker is:
A transferred coins to D.
B transferred coins to C.
Unless there's some other use for litecoin here, it has added nothing in terms of security or safety.
Yes you are right but to say that you can do the transaction without being traced only using bitcoin is flawed. You need something to trade otherwise trading btc for btc makes no sense.
Then trade for gold rounds. Trade for literally anything physical. None of that stuff is on a blockchain. That still gives data miners
less information than trading LTC for BTC.