I asked Copilot what that means in simple terms. The answer is shown below, and noting that my understanding is that AVZ is the claimant.
"In simple terms, the Claimants (the people who started the case) have sent their comments or arguments about whether the court or tribunal should deal with jurisdictional issues before looking at the rest of the case.
Jurisdiction is about whether the court has the power to hear the case at all. Sometimes, one side argues that the court doesn’t have authority, and they want that issue settled first. The Claimants are responding to that request—they're saying whether they agree or disagree and explaining their reasons."