Besides, anybody who uses a centralized service should already know the risks of them keeping a record or even being a honeypot. Be it ChipMixer or Wasabi centralized coordinator which we know for sure is working with anti privacy companies and actively censoring transactions.
There are never any risks when using Wasabi because there is no data revealed by users for anyone to keep a record of. Even if a coordinator is operated by a malicious entity, they cannot deanonymize you or link your transactions together. Chipmixer is entirely the opposite, they gain complete knowledge and access to all of their users' funds.
We all know that you are promoting Wasabi Wallet and for that purpose, you will try to prove Chipmixer and other mixing services as scam (When they are not).
That could be a mixing but not in a deeper level, but your transactions can be traceable, especially if a particular exchange is obligated to disclose your transaction information on their platform. We have a government agency that oversees this, known as the Anti-Money Laundering Council. So, if you simply desire privacy for mixing and haven't engaged in any illegal activities, that should be sufficient to achieve your purpose.
So if he uses exch.cx or any instant exchange and convert his money into XMR, then i think he is more secure and even the blockchain analysis companies won't be able to figure out much as once the coins are converted to XMR, then to trace it further becomes impossible.