Case T-33/20: Judgment of the General Court of 9 February 2022 — Van Walle v ECDC (Civil service — Members of the temporary staff — ECDC staff members — Appraisal report for 2018 — Freedom of expression — Obligation to state reasons — Case requiring a specific statement of reasons — Manifest error of assessment — Duty to have regard for the welfare of officials — Right to be heard)