But either you accept that blockchain analysis is bullshit and therefore all their claims should be completely dismissed and ignored, or you believe they are completely accurate in which case you must also accept that the vast majority of mixer use is perfectly legitimate, as they themselves claim.
There isn't room for a middle ground? Seems like its pretty easy to prove that at least some of it is correct. People perform blockchain analysis on this forum all the time, mainly for the sake of connecting alt accounts or exposing cheaters/liars. And they aren't government-funded professionals... Just people capable of pointing out that Address A is linked to Address B through Transaction C.
Having said that, I don't think that analysis being used to condemn individuals and potentially take away their freedoms should be so complicated that they can't be independently replicated to produce the same conclusions.