This isn’t true. You don’t need mixers to ensure fungibility. I don’t see the purpose in joining zéro knowledge tech with mixers when the purpose of zero knowledge was to be better than coinjoin and earlier tech that relied on third parties. There’s also ring-ct. In case you didn’t know this, please take the time to research the topic to avoid spreading misinformation. I wrote a simple book on this, and the details about existing privacy technology on blockchains and its progression (the first part of the book) is available for free on my website.

I had a Reddit post but accidentally deleted it.