Myself I never heard about the Polish Death Camps. Reading the title, the holocaust did not even come to mind. I figured that maybe pre-WWII Poland had some Polish Death Camps. They were pretty authoritarian and militaristic, I hear, so actual Polish Death Camps seemed within the realm of possibilities to me. I actually have to agree talking about Auschwitz as the "Polish Death Camps" is an odd choice of words. Unless, I guess, you were already talking about Nazi Death Camps and only said Polish Death Camp to differentiate between those Polish Death Camps and Death Camps which were not on Polish soil. I suppose it would be more precise to say "Death Camp in Poland" or, as I just did, "Death Camp on Polish soil" rather than Polish Death Camp, but since you were already talking explicitly about Nazi rather than Polish Death Camps, that imprecision of saying Polish Death Camp seems okayish to me.
I am skeptical that the use of the phrase "Polish Death Camps" has lead to any actual misconceptions regarding Polish Death Camps, however. Or is there actually a meaningful trend to think of Polish Death Camps as actual Polish Death Camps? Never noticed that.
But having written this post, I definitely will be more considerate about my use of Polish Death Camp.