Just one scan?
On topic, it seems that Captain Adam here is simply using a comic book as a comparison to describe how he views time, in a non-linear fashion. He can "flip" to any time period, so he, in a metaphorical way, views the timeline as a "story". He does not quite literally transcend the universe and view it as complete fiction, because that conflicts with events that occur in the story. Superman has been to nil, and superman has interacted with quantum superman, which doesn't make sense if captain Adam is supposed to be some truly ontologically superior being.
Likewise, the Multiverse and it's existence is viewed as a very real thing by beings who scale ABOVE Captain Adam, which again would be weird if it was just some comic book from the perspective of nil.