This is nothing new and isn't different from Boeing in anything they mentioned in the article. Yes the 787 had issues, but the same types of testing occurred. The 787 was fundamentally different from previous Boeing aircraft with lots of primary components made by subcontractors. Lack of rigor and believing things would just work (too optimistic) from what I have heard on the outside.

Iron birds, flight tests, etc are the requirements from the certification authorities. I.e. this is a fluff piece acting as journalism where the title and conclusions don't match the data.