The labeling attack could be done by the coordinator, i.e. the samourai guys. This means that if they were bad actors they could decrypt the coinjoins, it also means that even if they were not bad actors if the coordinator was taken over by some 3 letter agency (knowingly or unknowingly) they could perform the attack themselves and it also means as has happened that if an agency seizes the coordinator's server and they have not deleted the logs it can also be decrypted. So it is all a matter of faith. Other coordinators and coinjoin methods have this problem mitigated.