Whether the respondent must pay costs/dépens to the successful appellant after remand
Yes. The respondent, as the unsuccessful party, must pay the appellant an indemnity for costs and legal expenses.
Under Art. 61 let. g LPGA and Art. 7 TFJAS, a successful party represented by professional counsel is entitled to reimbursement of necessary costs; considering the importance and complexity of the dispute, the indemnity was set at CHF 2,000 including VAT.