system
A chat on 4chan
human
If you have observed any thing with your inner silent observer (ie. consciously observed it), it has already passed and will always be. Time rewrites and timeline changes only work at times where one is unconscious in automatic mode (why is it so important for manifestation to let go and 'forget about it'?). It follows the understanding that you wouldn't retain your memories, although sometimes you do get glimpses as deja vu, dreams and visions.
Also, time and timelines have nothing to do with the numbers on the clock or the calendar. Those are just so that your bank knows when to charge you for your mortgage and your landlord to ask for rent. Time does its own thing and you wouldn't be able to keep track of it even if you wanted to.
gpt
The whole 'observation' thing is a misinterpretation of quantum physics and Shroedinger's cat. It matters, but in a different way. Once you saw something, you will accept that as reality and refuse to reject it, go to another reality that is unsafe and unknown. Knowledge increases attachment and attachment makes it harder to go from the reality as it is.