Autofiction: New York Times Book Review of fictionalized memoir says it uses novelistic technique, but novelists use multiple personality, not technique.

Autofiction: https://en.wikipedia.org/wiki/Autofiction

“Autofiction has long picked away at the boundary between fiction and nonfiction…The term covers a multitude of approaches; here Malmquist sets his novel in opposition to the very meaning of ‘memoir,’ which implies a recollection of something past. In Every Moment We Are Still Alive is narrated in a vivid present tense that collapses the distance between the time of narration and the harrowing events of the story” https://www.nytimes.com/2018/01/29/books/review/in-every-moment-we-are-still-alive-tom-malmquist.html

Is Malmquist’s present-tense narration a technique? Did his one and only personality decide to imagine and remember how past events in his life were experienced at the time, and present them from that point of view?

Or, as I would guess, does he have an alternate personality, who originated to help deal with those traumatic events, does not age, continues to live in that past, and has provided the present-tense narration?