How do you know Chipmixer kept the logs? Do you have any evidence or source of information for this?
And what is the connection between the Chipmixer case and the takedown of the dark market that you mentioned?
What will prove this theory is if more dark web sites were closed during the current (and next year) more than the average in the past years, then there is certainly important data they obtained from CM.
Even so, it won't prove anything. Already many sites were closed, before the CM was closed.
We have to take into account, that in the last 2~3 years the authorities have invested a lot in cyber investigation. So it's normal to see more and more of these types of sites being closed down. Added to this is the fact that today there are many more sites of the genre than there were 5 years ago. Soon this will increase arrests.
Therefore, associating one thing with another, without clear evidence, is pure speculation.