He did not; only the Wasabi client is open-source and verifiable, not the backend. They are completely centralized and could be doing all sorts of shenanigans on top of the published coordinator code.
There is no closed / non-verifiable backend to be worried about in Bisq, Electrum, Bitcoin, Linux and Tor, though.
I could also argue that no other Bitcoin wallet have coinjoin implementation, except maybe Sparrow wallet that is using Samourai Wallet Whirlpool, so it's not ordinary wallet.
If there is any other wallet option we can use that is fully open source with coinjoin I would like to hear more about it.
Only option I know for privacy other than mentioned above is mercurywallet.com, but this is using Bitcoin Layer 2 solution.
Wasabi is attackable just like Electrum is, when using the default server. There is no way of knowing whether an Electrum server is logging extra data, tying data together by IPs and doing other such types of nonsense. This makes running your own Bitcoin node + Electrum server so important.
Yeah I agree, but majority of people is still running Electrum without their own nodes/server.