In reality, I seriously doubt much of the people within the Qanon movement are even aware of this lawsuit, the declarations given under oath and the released text messages between top Fox hosts about what they really thought about the state of the election.
Many of them only watch Fox and similar media on internet and since mostly is the left media which is reporting on the Dominion lawsuit, it is possible they are not informed at all.
I think you might be right. It's not like Fox news want to cover a huge loss of credibility and they won't be watching anything else then right wing news. I guess fox news pays the bill and moves on like nothing happened. Except i wonder if their viewers pick up the fact that they will stop talking about the voting machines now. In best case they might even be more careful to pick their battles, and choose more carefully who they are attacking without evidence.