I have no idea why someone would want to create a new mixer but using a name already used before. After using all TLDs possible to set up scams, they're probably now moving to reuse domain names of closed mixers who left without scamming users.
This was what i was think about too.
Unless the intent of the person behind the new reemergence is to make people think it's the very same past non scamming cryptomixer, make people trust it and then scam them i don't see any other reason the person who use the exact same name of the past mixer.
This could probably be a new tactic that is being employed by scammers to scam unsuspecting people.
Even if this domain not used for a long time, this domain probably has a better rank position than newly created. He will use old SEO, backlinks to this domain. Also, maybe the new owner plans to run regular service.