OP I think it's time you removed atob mixer from the list and included it in the list of scam/shady mixers.
@Crazymoon sent a PM and i can confirm that they haven't mixed and sent him his BTC. It's crazy because he has been complaining about this for over 2 weeks now

I have also seen another user complaining about the mixer which should be more than enough confirm that the atobmixer chaps are shady and most likely exit scammers especially if i remember the way the were fighting so hard to get their mixer on your list.
100% sure this is a scam.
Here is why I think that:
1. I used the URL:
http://atobmix5vwucluyj.onion/ and when I "Check Mix" the status is: Status : "Waiting For Funds"

2. I contacted the admin via:
http://atobmix5vwucluyj.onion/contact/ and got no response.
3. I checked the transaction ID on Blockchain.com and the received time is 2020-03-10 18:59 with 237 confirmations. I'd be happy to share the transactionID with an admin over PGP.
Note: I will edit or repost if anything is resolved, but tread this with the upmost caution based on my experience and the posted before meIt seems I'm 0/2 with mixers recently and I'm down $500. Its a shame as these formerly reliable services have been replaced by sprawling scams. I think the only legit solution I'd try in the future is Wasabi Wallet's coin join and similar methodologies.