Board Thread:The Flash discussions/@comment-44904262-20200121144107/@comment-37062554-20200122223514

They stated in Crisis part one that the timeline has been altered and the date of the crisis has been moved up to 2019 instead of 2024 as in the original timeline aka pre season one. Eobard was tied to the original timeline and set the events in motion. After he got stuck in the past after killing Nora, he had to try and keep setting up his timeline so that he could exist in the first place. After he was wiped from reality that no longer can happen.