Both are true. Yes, Wasabi is partnering with blockchain analysis company and buying the notion that coins are unequal, so they cannot be trusted. And yes, their software is flawed. I don't know with certainty if it's more of a back end or front end issue (probably both), but we frequently notice coinjoin reusing addresses in both inputs and outputs.

Here's another reason for not trusting Wasabi folks: they are assholes. Kruw has accused nearly every participant of a mixer signature campaign as guilty for coin theft with absolutely no evidence. nopara73 is doxxing their competitors on Twitter. Max Hillebrand is one big of a hypocrite. Any sane person reading the open letter to Wasabi team can make out they're running a clown show.