Seems legit. Perhaps after all these years, some of the carriers of his fragmented soul (i.e. mandati) were dragged before the IF. Seswatha was eventually converted to the Consult, but had no way of changing the path he set in motion, until Achamian came along. For whatever reason he was able to change the dreams for him, and Akka is actually working for the consult, unbeknownst to him. Seswatha had him find Ishual so that he could destroy it, go into some kind of blind rage and burn down everything that resembled Kellhus.