Because of how Monero works, your crypto is now fully anonymous. You can now swap it back for bitcoin or any other crypto, and your coins are untraceable.
how should he swap them to keep them anonymous? using any centralized exchange would make them known to him again. which would kill the whole point.
I think A Good mixer is still better than all these hassles.
What he suggest works since Monero is fully privacy token which means it’s untraceable once you already sent it to other Monero wallet.
He suggest to use a DEX to purchase monero using his Bitcoin in able to have a fully privacy monero to begin the wash. There’s no problem anymore if you will send it on centralized exchange or something that will expose your identity because the token is already clean. The whole point of mixing or chasing privacy is to erase the source of that token that will lead to you.
Not all user is mixing just to hide their money. Some are mixing to getaway from whatever shit they did just to acquire that particular Bitcoin.