The article says it’s the world’s largest supermax. I don’t know the capacity for other supermax prisons in the US. I understand other supermax prisons are not necessarily stand alone buildings, but this one is. Maybe that’s the difference.
I read the linked article and there was no mention of it being a supermax. And China town would be a pretty strange place for a supermax. I think this is just a jail, aka "detention center". It did say "the worlds tallest", and I suspect the headline writer just did what headline writers do...