I’m not an expert on it, but I’ve done a certain amount of study on it.
I’m pretty sure there are no privacy guarantees for money receivers. Merchants/sellers would still be identifiable by banks and governments and such. So Taler isn’t what anyone selling heroin or doing murder for hire would want to be using as an accepted payment method. (At least not any more so than credit/debit card transactions will help the seller with keeping their doings secret.)
But Taler can keep the buyers’ identity secret. Unless you’re doing things in ways that reveal information about yourself, your bank and your government wouldn’t know you were buying fursuits even if they knew the merchant was selling fursuits.
So all that to say that no, the merchant couldn’t cash out anonymously.