@Darth_Algar One can see a long way… in SPAAAAACE…
Of course, one can also pick up radio signals a long way, in SPAAAACE… and we’ve been broadcasting radio, TV, and even speciically SETI (Search or Extra-Terrestrial Intelligence) signals for over a century, and presumably any aliens who can get from star to star will have even more/better sensors than we do.
Even in an impossibly-dedicated/imaginative/united/insane/stupid/pointless effort to do something (say, as @ragingloli suggested, to liquefy the planetary surface with energy), not only would they have picked up our signals from before, but when they got here, the surface would look very peculiar and no doubt show telltale radioactivity not found elsewhere.
Maybe @RedDeerGuy1 ‘s earthlings will need to elevate their goal to never having existed, like a certain fictional alien culture in a classic sci fi story (by Asimov?). However in that story, the alien from that culture despairs of ever finding a way to accomplish that goal.