Sorry, but in truth, concentration camps mean exactly what the English words say: “concentrating” people in a camp. Doesn’t have to do with killing, or slavery, or anything. It is a general term. Japanese-(and others, when possible) Americans were put in concentration camps. Since people became sensitive to what NAZIs did, they started calling them “internment camps” to distinguish their treatment. But basically, “concentration” camp is just fine for any effort to coral people in a specific place.
Meanwhile, merely being arrested is not the same as being taken to a concentration camp. Nor is staying in your chosen camp while being “threatened” by police.
You’re denying the actual usage of the word in communication. Dictionary meanings often change when in normal use—for example, “Xerox” doesn’t mean “I copied this using a Xerox machine,” but is a generic term for making a photocopy.
To pretend “concentration camp’s” very specific meaning, and how it is meant in the context of this tweet (a “tweet” being another example of altering usage) doesn’t make sense, no offense intended.
Concentration camps were first used by the British to "KILL" women & children during the Boer war.
That allowed Britannia to steal gold & diamonds without being bothered by the pesky Dutch settlers who were there first.