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There's a big difference between "How many people do you think were killed during the Holocaust?" as an open ended question as opposed to "Do you think the number of holocaust deaths were exaggerated"?
There's a big difference between someone that is just ignorant and someone that believes in lies.
That being said, far too many people deny how big and horrible it was.
What percentage of that 23% actually knew what the holocaust was, and did not need it explaining or doing a search? >


More than half the respondents to the American organisation’s survey did not know six million Jews were murdered and 29% believe the death toll was below two million. >

I wonder how the survey was done. To assert something is exaggerated versus not knowing the true number are very different things.