I would love there to be evidence discovered that aliens had visited Earth in the past. It would be amazing on several levels. And I have followed the subject in great depth for more than 40 years. So far, it's all wishful thinking or just plain exploitive quackery. It would have been incredibly easy for star travelling aliens to give us info that was UNMISTAKEABLY of alien origin. Like a depiction of Saturn's rings. A map of the far side of the moon. A model of the solar system including Neptune, Uranus, and Pluto. Jupiter with four large moons. Mars with two tiny moons. Instead of this, ancient alien enthusiasts present us with stuff like the link, dubious stretched interpretations of stuff that archeologists have no trouble explaining without invoking aliens. It would be amazing, but so far, no evidence has been presented that is even remotely compelling.