ʻOumuamua is a fascinating object, and certainly deserves further investigation. How could we discern design from non-design?
The discovery of ETs would not undermine the case for the design of terrestrial life one bit. The situation for Darwinists is very different.
The first pictures of an eclipse from the surface of another planet were taken by NASA’s Opportunity rover on the surface of Mars in March 2004.
We have Trojan asteroids in our Solar System that orbit with Jupiter. But, there isn’t any evidence of actual Trojan planets.