User blog comment:Bo-Katan/Thawne and Time Remnants/@comment-6284741-20171203203101/@comment-27700324-20171204052720

Well the proof he was taken into the speed force is that he disintegrates just like Barry did when he was taken into the Speed Force. With the colors of orange going off of him instead of blue like what happens when someone is erased from existence.

Legends Eobard remembers everything because the timeline is slowly fixing him to fit into this new reality. Sort of like how Diggle was given his past about his son instead of his daughter after Flashpoint.