If you have status and/or flying business just get some food/drink in any restaurant and then send receipt for reimbursement 🤷🏻‍♂️

While I understand the frustration as I am using DUB, there is nothing staff can do. They are not LH/LX staff.
LH group did not prepared anything before the lounge closure and did not manage to work with the DAA to sort out alternative lounge access elsewhere for certain pax.