Most proposed interstellar missions (including the article) are just flybys. We won't learn much more about how to do flybys by observing our own solar system.

Most proposed interstellar missions (including the article) are just flybys. We won't learn much more about how to do flybys by observing our own solar system. The data from such a flyby might build the support necessary to develop propulsion technologies that allow us to slow down at interstellar targets. But they'd be decades into the future, by that time we will have done a lot more exploration in our solar system as well