Somehow I am now the go-between between Bisq and Whonix (god help us all) and I was asked these questions, which I am not qualified to answer with certainty so I answer here:
On which IP / port is Bisq listening inside Whonix-Workstation?
Does Bisq still use the Tor control protocol to create its Onion Service?
Does Bisq require an Onion Service nowadays?