Like I said previously. It would be total guess work to find the sending and receiving addresses and it would require that the coin have close to 0 transactions at the time the transfer was made.
Ok, fair enough, if it is
literally "total guess work" then it IS 100% anon, because LE can not use "total guesswork" to obtain a warrant or lock someone up for tax evasion (just examples) , and nor can anyone else.
If it only works properly when lots of people are using it at the same time then its really no better of a solution than a coin tumbler with random fee and tor imo.
its the same as : how can someone trace my bitcoins when ive deposited some of my bitcoins and withdrawn a different amount of someone elses coins back out of a tumbler? total guesswork?
There is often a weak point in these mixing systems, and that is that somewhere in the world there must be a computer/s doing the mixing, and how can we trust that computer is not being monitored somehow.