If no, i doubt anyone can provide proof unless someone who works there become whistleblower.
Or someone could simply do one easy experiment with sending their coins to wasabi coinjoin and see what happens... if bomb will explode, special forces storm your apartment, and your transaction gets rejected for some reason.
Full disclosure, when I did my review of wasabi wallet few months ago I was not able to complete my coinjoin for unknown reasons, after trying for few days.
During this time there was some issue with Tor network so this could be one of the reasons.
One more problem I faced is that I was not able to connect Trezor device with wasabi wallet, and I was not the only one with this issue.