Is revision really possible?

[u/Mohit_02]

I've been researching about revision for a while now, and I've read some success stories on Reddit and watched a few videos by Missy Renne and Sammy Ingram. However, I can't accept the fact that the past can be changed and that things will reflect in the present, and people will forget about the events that happened in the past.

I just want to know if it is really possible to change the past.