There was no comment about how it was reasonable to make the phone call, and there's specific criticism of the police conduct... All they said was that at the point CPS got involved, it's entirely possible that CPS did their job exactly as they should have.

I would point out that all we know that CPS did was a) require that the parents not be left alone in the house with the kids while they were conducting their investigation (and even for that, it's not clear from the story that that requirement came from CPS, but it seems likely that's the case) and b) perform an investigation that concluded there was no observable risk to the kids. They weren't involve in the decision to perform the arrest, not involved in setting bail, not involved in any strip search, etc.