I mean, “internment camp” is just an accurate description regardless of conditions. It is a camp where civilians are imprisoned or “interned” without formal charges or sentencing by the standard criminal justice system. That it’s an internment camp isn’t even a debatable point.

It’s the euphemism they use to avoid “concentration camps”, which is what these are due to the awful conditions. Those have an even worse reputation because they often turn out to be death camps. Weirdly, if you put people in inhumane conditions you necessarily dehumanize them, and at some point you just start killing them rather than keep an increasing number of people you don’t see as people alive in increasingly poor conditions.