User blog comment:IHHeroes/Changes going forward after Crisis/@comment-39280494-20200116034036/@comment-1839-20200116152354

If J'onn was giving everyone their own memories he would have had to telepathically copied the memories from everyone in the first place. Maybe he had contact with Nash (offscreen or onscreen and I had forgotten) and copied Pariah's memories. But I doubt that he did that for everyone on Earth-1, 38 and BL.