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They have a number of blockchain transaction tracing tools at their disposal, so it's likely that they were able to trace the transactions. The other mistake you did was to reuse the address. If you are privacy conscious, once you reuse an address, the privacy level drops, and you made the job so easy for them.
I receive my weekly payment from the signature campaign on the same address, and then I transfer it to my account on Binance. I may also use the same address when I am not at my desk to generate a new address from my wallet.
It also happens that I buy crypto from a local seller who uses one address that is sent to me directly to one of my accounts on the trading platforms.
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IMO, I think mixing coins should go hand in hand with using a good noncustodial p2p service. Unfortunately, one of my most use p2p service, localcryptos is shutdown their business. I don't see the point of mixing coins then sending them to a centralized exchange.
I know there is no point in sending Mixing amount to a centralized platform since they can track the transfers. But as I mentioned earlier, I do not need to use the mixer, but this was on the occasion of my participation in a paid review campaign.