This is for an opinionated definition of "optimal". It might even be correct in specific scenarios, but really looks more like a thinly veiled ad of, "We do software dev, this is the stack we code in, and this is why we like it."
There isn't anything wrong with that take, but it is not a study, and it is not a universal answer.
A study about the optimal stack for web apps, balancing performance, developer experience, and testability.
It seems completely flawed as it's basically javascript-centric.