I think you have more correctly described what I read.
It just got me to thinking about where they would actually have to originate from, and what those implications are. Absent some time-space travel bend by going the speed of light, they would have to come from our solar system, which does not appear to have even the most remote chance of happening.
Interstellar distances are vast. Even with a sufficiently advanced technology indistinguishable by us from magic, traveling to a foreign planet would still be a non-trivial undertaking. I can't imagine a sophisticated and technological civilization mounting an expedition to our planet for the purpose of making "beep-beep" noises in front of some poor farmer whom no one will believe anyway.