Article 6(a) of Regulation (EU) 2017/1369 states that visual advertisements or technical promotional material for a specific model shall make reference to the energy efficiency class and the range of the efficiency classes available on the label.
When technical information for the appliances as well as links to dealer offers are provided, it is technical promotional material.
Disclaimer: Please note that the European Commission cannot provide a legally binding interpretation of the EU legislation, as this is the sole competence of the European Court of Justice. Any remarks from the European Commission services are without prejudice to the position the Commission might take should related cases arise in a procedure before the Court of Justice.