No. KYC is to the person not the utxos. There is no kyc on bitcoin. It simply links you to a utxo. Sending the utxo to cashu or even to whirlpool doesn’t get rid of kyc. It obfuscates the spending of a utxo. If foe any reason an authority wants to force you to prove you still haven’t sold your bitcoin without properly paying capital gains on it then you would be facing that issue. There is an important distinction. The transaction can be hidden but the legal obligations of kyc in the future aren’t removed. The kyc is at the custodian not the blockchain.