Indeed, L'agentsecret outlines the airlines viewpoint.
Cases are decided by national courts not the ECJ, and the phrasing of the Sturgeon case by the ECJ is "weak" as it states that "passengers whose flights are delayed may be treated, for the purposes of the application of the right to compensation, as passengers whose flights are cancelled and they may thus rely on the right to compensation laid down in Article 7 . A clearer wording would have been "must" rather than "may".