Wow, this statement is just full of bullshit tbh. The only logical explanation for me to read this is that LE took control over that account as well as the mixer itself and then wrote that stupid as hell post.
Bitcoin is a transparent non-anonymous system by design, huh? Who told you that ffs? Have you ever looked into white paper? I'm quite dubious about that, because when you search for key words it gives you 0 (!) results for the word "transparent". However it has a separate chapter called "PRIVACY" where bitcoin is compared to traditional banking system and you can clearly see that Satoshi was striving to break the link between individuals and transactions as much as possible.
Second, your point about criminals. In the first place you were offering money laundering service. Did it really take you so much time to realize the target audience for this?! I mean, REALLY?!! If you were THAT much narrow-minded then I don't believe a person like you would be smart enough to arrange that site.
Anyway, I hope that the team behind bitmixer is in good health and they were let go

.