It doesn't appear to be stress testing anything, it's [edit: removed calculating] estimating where a structure or material is stressed. Stress testing is a physical process, and the article gives no indication that stress testing could or would be replaced but this.

Edit: Further elaboration from the article: product designers, for example, could test the viability of their ideas before passing the project along to an engineering team

This would seem to clearly indicate that the intended application is faster iteration in design, not a replacement for a rigorous engineering process that would include appropriate testing.