Yes - and I'm British so I should know what is a concentration camp and what isn't!
However, if you are using the traditional definition of concentration camp as carried out by the Nazis in Eastern Europe in the 1940s, I have a BIG problem with the statement, because your Gaza example is missing a few essentials such as gas "showers", crematoria, etc.
Those were the "Vernichtungslager" - "destruction camps": Auschwitz-Birkenau, Treblinka, Maydanek, Sobibor, Chelmno and Struthof, where the victims were brought in and (most of them) immediately murdered.
The "Konzentrationslager" - KL in Nazi parlance, KZ in modern abbreviation - didn't have gas chambers, or at most one very modest-sized one, because the object was not to immediately destroy the victims, but "merely" to lock them up, typically under-nourished, overworked and daily bullied by the camp guards. Death rates were very high, but not the prime objective. This applies to the majority of the Nazi camps: Dachau, Mauthausen, Neuengamme, Ravensbrück, Bergen-Belsen, Hertogenbosch, Theresienstadt, Dora-Mittelbau, Buchenwald, etc.
This type of concentration camp, as Darat noticed, was first used on large scale by the British in the Boer Wars, in an attempt to bully the Boers into submission by locking up their women and children, and also to deprive the Boers' guerilla style war from their needed operation base.