tl;dr: Null. Lagrangian mechanics are a way of expressing classical Newtonian physics in the language of symplectic geometry. It's been done for 30-40 years an

tl;dr: Null. Lagrangian mechanics are a way of expressing classical Newtonian physics in the language of symplectic geometry. It's been done for 30-40 years and has nothing to do with quantum mechanics. The people who wrote this may be highly educated, and one of them even a physicist, but if both of them actually read this they don't understand what they're talking about.