Tim breaks it down better than anyone.
Obviously no one can alter the past. Then can and do mess with people’s ability to recall, witness, and think.
One of the tenets of psyops is disorientation. If you are spinning in your recollections, and can’t be sure of your own ability to recall or reason, it’s the same as being lied to.
Here’s a good primer. I will reupload Tom’s critical audio shortly. Link.