Since I haven't been involved with Bitcoin for a long time, I have no idea about the current technical circumstances, but I came across an article reporting that Arkham Intelligence has developed algorithms and patterns to completely deanonymize transactions, even Coinjoins.
And you believe that? That means you do not know how coinjoin is working. A transaction can be known to be from coinjoin, but the coin is mixed already in a way that no tech can know which is which after the coinjoin.