It’s a reference to the language and tone of the policies of the specific regime who committed the holocaust.
He didn’t say “it’s typical of the sort of language used by many racist or autocratic regimes throughout history” - he has specifically chosen to reference this regime because of the cultural resonance it carries, particularly in the popular British imagination, because of what it went on to do.
He didn’t say “it’s like the language used by the Nazis, although please note i obviously mean the language used by the early 1930s Nazis prior to starting construction of Dachau in March 1933 after which they because a totally distinct and separate brand of Nazi with a new vernacular NOT at all like the policies of the current Conservative Government”
And we don’t get to decide what descendants of victims of the holocaust should and should not find offensive, i’m afraid mate.