Hi human, I notice no one has answered your question, either because they don't know, or more likely, because there is not a lot of sympathy for the plight of poor old Chris here (none from me either)...however, to answer your question, while I'm sure the circumstances of his incarceration sound horrible to you, and likely protocols vary from state to state and county to county, in this case (IMO), I believe his isolation is not punishment but is in place for his protection.
First, his is a super high-profile case, which in and of itself makes him a target for violence and harassment from other prisoners, and worse, he is an alleged child killer, who at a minimum, disposed of his little girls' bodies in oil tanks. That is not likely to make him popular with other inmates.
Second, if the People article in which a source is cited as saying he is despondent and suicidal, and he needs to be on suicide watch 24-7, they likely have to keep him under close watch and that can't really be done if he is gen pop. At the end of the day, the local jail has a responsibility to keep him alive until trial, not happy and entertained.
So while I agree that our justice and jail system can be scary if you are an innocent POC, you would have to have some pretty bad unlucky circumstances like be a mistakenly incarcerated suicidal person in a super-high profile murder of small children to likely find yourself in these circumstances.
P.S. Oh, and I really wish this wasn't my first post in this thread that I have been trying to catch up on for ages. I have only a bit to say that hasn't been said by the many brilliant minds here already but that won't stop me from chiming in later!