Pilot waves, multiverse and Copenhagen are fundamentally ineligible for experimental support, at least with respect to each other. They lead to the same numbers, meaning than an experiment that agrees with one will also agree with the others. It's something like trying to tell the difference between 2x=2y and x+2=y+2.

The "support" in the article is really just a physical system that obeys (as a macroscopic approximation) something like pilot waves: "just like the universe" if pilot waves are right, and "just like those silly nonlocalists" if pilot waves aren't.