Not really, the designer also has a great part in the execution of at least in the ambition of the execution.
The designer has the idea but he also needs to be skilled enough to answer to all technical questions a seamstress can ask.
You saw it for example at Givenchy when John Galliano left and McQueen took over. It was the same Atelier but despite McQueen ambitious designs, there were some badly made outfits in his first show. His quality evolved during that time.
The same at Dior when Raf took over. Some of his most ambitious designs were badly made even though he was working with one of the most impressive Atelier in fashion.
You can easily loose the respect of an Atelier if as a designer, you don’t know about clothes-making.
It’s too early to tell anything about Virginie’s construction. The collection is very safe. But it’s true that it’s only with her vision that she can inspire and drive an Atelier. I don’t expect from her to put concrete on her dresses but only a really skilled designer can push an Atelier to that.