This has likely been mentioned but I did see a few people, probably jokingly, ask why the "questionable relationship with another couple" part of the warrant was included or if it is relevant/matters since that isn't a crime by itself or anything:
It's not them being Scandinavian incel prudes, it's a big red flag for any home with a child neglect or abuse claim happening. Randos rotating in and out of households massively increase the risk of child sexual abuse. If Mom and Dad are too Benzo'd up/Coked out/Drunk/whatever the fuck to notice or care that the kids haven't been getting any meals, aren't bathing and stink, and don't have any clean clothes... they aren't going to notice or care or even believe that sexual abuse is happening. The state of the house described in warrant are ideal for this kind of thing to happen and (in a perfect world, should) increase the urgency in addressing it.
It could have also been included because the officer mentioned Aaron's show and his recent claims of cocaine and MDMA use, timing with the Rekeita's, but to me it sent up a different concern the county would also have.
e: I don't believe April or Aaron did anything to the kids like this, but again, it should be a red flag to professionals and worth including in the concerns for the children.