Whether you view that as compliment or criticism will depend largely on what you expect from the GLE Coupe.
Improving on the existing formula was always going to be difficult, SUV coupes are still at the crux, SUV's. Auto Express had their time in a GLE 350d Coupe but always came back to the fact that the big Merc simply can't hide its weight despite the sveltely carved bodywork.
Things may be different with the GLE 63 S, but you'll likely sacrifice some of the quietness and refinement Auto Express praises the diesel for.
Other then brand preference I can't see anyone being swayed either way by either product. Design wise the two are extremely similar, Auto Express goes so far to call it an X6 clone...