Unless........................they have them already.............
we made tremendous advancements thru Space X, but as far as inter stellar, I havent seen any Ion Drives being boasted about lately! and I cant really imagine they would depend on gravitational “Sling Shots” to propel them thru this Navigation system!
basicly I don’t know jack about it all... just seems a bit premature. in all things Space Travel, one could say we just invented the wheel in regards to Propulsion! just sayin...