Assuming we live in a simulation,theoretically,we could.But I believe we are nowhere near that advanced.If we take a "simulation" we are able to create and recreate in a base,such as Skyrim for instance,and compare than to us,they could never figure out that it is possible to open the console and revive a dead person,but they have seen it happen.Maybe they go by their day to day lives without realizing that I turned off the PC and went outside to do stuff or logged in to Reddit to discuss the Simulation Theory,until I deleted the save file and rebooted their universe,and maybe the ones run our simulated reality "play" our entire lives over the course of an hour.Maybe(certainly),time is not the same for us than it is to them(the ones above us and the characters of Skyrim). Time would then,in my understanding,be one of the hardest things to recreate in a simulation,as in a file being overwritten several times and with so much "cheating" by the ones running the simulation(babies come back to life,a man dies for 3 days and ascends into the sky,or other things we find over the glitch in the matrix subreddit for example)it would eventually become corrupted,and things that happened in an earlier save,a different timeline,would bleed into our save file.Maybe that is why those ghosts never talked to you or even realized you were there.Maybe they were "printed" in Time,and for that specific moment,bled into our save file.And that may or may not happen again.

I have no way to prove this,but it is the explanation I could come up with.Since I assumed we're living in a simulation,I also assume my simulated intelligence is not enough to fully understand what happens :(