queation on Terminator 2018

In this episode, the headquater of Skynet was destroyed completely, the factory of building T-800 was exploded also, then Human would already win this war, how the story to be continue, and how the next episode can make out a good case that T-800 will be sent to kill Jone Corner's mother?
In this episode, Jone Corner know that Karle Rease is/will be his father by he sending he go back past to save his mother, but the logic is he, Jone Corner has already exist even he wouldn't send Karle to back. So I have to ask if he don't send karle back would himself disappeared suddenly? That will be so strange and will be anti-scientifical.