That's really his out, that his mom, as fucked up as she is, just doesn't want him in prison and puts the kibosh on the prosecution. If Chris gets thrown in prison she's basically alone until she dies.
That's not going to happen. Let's consider everything that's happened and come to light in the last 72 hours and make the assumption that the police are doing the bare minimum in regards to their job:
1. Chris admits to banging Barb. This was in both audio format and
multiple text messages. The police would have taken these as a confession, especially the confessions he made AFTER the EPO was enstated.
2. Chris was barred from entering 14 BC and Barb was taken into protective care. As their house would be considered a crime scene, the police would have access to gather evidence from the scene, including the book Chris posted pictures of online, "Sex & Disability", the sex toys/bdsm gear Chris claimed to have used, and given that the two are hoarders that share a bed and never clean anything, I'd be willing to bet they'd find a the fallout of their multiple sexual encounters.
3. Chris is an idiot. I'd be willing to bet he's already told the police he banged his mom but that it was consensual by now. Again, because he's an idiot, that doesn't matter, you still committed incest. It's like if you have a recording of a dead person saying "I am of sound mind and consent to being murdered" it does not matter, it's still murder.
Right now, charges of sexual assault and incest on Barb are likely being held off on until the courts can determine if Barb has the mental facilities to consent. Whether or not Barb consented however, doesn't matter; the charge of incest on Chris is going to stick and he's going to likely end up in prison with his fat ass being used as a walk-in closet by someone to store contriband.