Think of it this way.
In terms of physics, a spaceship that as the article describes crashing into the Earth, isn't able to pass light speed even when considering the most wacky theoretical science possible.
Even if the aliens are ancestors of ancient nomads traveling through deep space and checking out rocky planets on the way, the ship would be loving huge so it could store all of the necessary supplies for any living thing to survive.
So yeah, unless the ship was the size of Manhattan and nobody noticed it, I call BS.