Case T-764/20: Judgment of the General Court of 21 February 2024 — Anhui Wanwei Updated High-Tech Material Industry and Inner Mongolia Mengwei Technology v Commission (Dumping — Imports of certain polyvinyl alcohols originating in China — Definitive anti-dumping duty — Implementing Regulation (EU) 2020/1336 — Calculation of the normal value — Significant distortions in the exporting country — Article 2(6a) of Regulation (EU) 2016/1036 — WTO law — Principle of consistent interpretation — Price undercutting — Market segments — Product control number method — Article 3(2) and (3) of Regulation 2016/1036 — Rights of the defence — Confidential treatment — Articles 19 and 20 of Regulation 2016/1036)