The article seems to me just a regular criticism, not her saying she could do better?

Counterpoint to your view on critics. A discerning audience is equally as important to a thriving culture as artists. If critics just clap their hands whenever someone tries to make something, granting that making a bad work of art is often just as difficult as making a good one, we get junk. I don't see why the perspective of the maker is relevant at all.

“You don't have to lay an egg to know if it tastes good.” - Pauline Kael