User blog comment:Itamar20112/Arrow 8x01 - A good episode, but kinda breaks the Arrowverse/@comment-28109177-20191016175624

Well they never specifically confirmed his fate so maybe something happened in between 2015 and 2019. Also the timeline simply could've been changed by any speedster there so who really knows. Remember when Jesse Wells and Harry came to Earth 1 after Barry created Flashpoint, they could tell things were different because Different Earth, Different Timeline