You're a little retarded. Did you even read the first reply to your 8 year old link? It's well documented that one coinjoin is insuffiecient for privacy (https://github.com/JoinMarket-Org/joinmarket-clientserver/blob/master/docs/USAGE.md#try-out-a-coinjoin-using-sendpaymentpy).
>explain to me how a user can measure the privacy gained by a JM coinjoin
Someone stole 445 btc and used joinmarket to mix it. The theft victim offered half the btc if anyone could unmix it. No one could.