i did think this was gonna happen i knew it was messy when i first typed it up but i needed to get it down so the way time travel works in terms of its difference from reality is what you need to look at. amuse time travel is possible in reality for this point I go back in time move a vase from one stand to another and because of this it is shattered now i don't want this to happen so i go back in time and try to change this this is where reality and steins gate split in reality i got back meet my self and stop it but I now also meet my self so i don't move it so i don't go back it time again paradox. in steins gate i go back the me who moved the vase no longer exist but i still recall it because of reading Steiner. its perspective linearity that's the best way to describe it. I in traveling back in time and on a new world line even before i change it because i am going to change it. technically me being there is a change in itself (I will give a full explanation of time travel and fixed events at a later point when time permits)

Deleting the data SERN can't save Mayuri. He gives a reason but it's incoherent. using the apple analogy again they are not removing it or changing the force it is throwing a rock at it in mid flight. sern are about to get the time travel tech they need but in deleting the message they no longer receive it and so the world line redirects once more to 0.571024 or the original world line they started on.

I kind of already answered this but Okabe needs to still have the same liner path to his end from a experience point of view he travels across multiple world lines but he must always follow the same path across the world lines from the single travels point of view he can change the past but he cant change his jumps (I'm rambling again) OK when he corrects a message from the past e.g he cancels the lotto ticket he doesn't cancel the jump he jumps again so he jumped from one line to the next and then back again apple analogy the apple is still moving in the air but now a stone hits it back up where it came from on the x axis at least