@OP I'm sorry to say this, but it's really stupid when you link mixed coins to centralized exchange because centralized exchange will never want to accept sources from a mixer. Even you send your mixed coins to your non custodial wallet before you send to the centralized exchange, it will not remove anything since it's called as "concealing a transaction".

So if you want to mix your coins, you must cash out through no KYC P2P, direct P2P or DEX.