User blog comment:JMOfficial/Flash Big Bads in the Future/@comment-26618197-20170817204320/@comment-27700324-20170820055447

Well, there is still a remnant trapped in a never ending cycle of becoming Harrison Wells and then dying. So yeah, he is gone and doesn't need to come back. He isn't appearing in the present like in Reverse Flash Returns because he wasn't displaced in the wrong time period.