TLDR: While Chainalysis is able to tell which coins are sent to and from mixers, the webinar confirmed that the service is unable to follow the trail of coins as they move through mixing services.
“We can identify funds going into services, including mixing services,” Curtis said. “A common misconception is that one can trace the path of funds through a service.”
In other words, mixing works.
Webinar which mainly talks about Ransomware attacks:
I don’t agree to everything mentioned by chainalysis however that is my personal opinion and it’s interesting for everyone who likes to know and research more about privacy in bitcoin transactions.