how do the scam vids do this??

so as usual i keep seeing those type of videos with a influencer in the background talking about how some app made them rich and I thought i would dm one of the people in the comments asking them if they were paid or if it’s actually real. So I messaged this girl who commented and she had no idea about it and said she didn’t even comment. She asked me to send the video to her and when i went to my viewer history it was gone, i also saved it in a separate folder and it wasn’t there either. How is this even possible??