If you read the article they talk about how Pew research did a study to find out why results like this happen and basically it has to do with people being incen

If you read the article they talk about how Pew research did a study to find out why results like this happen and basically it has to do with people being incentivized to give incorrect information to speed through tests and these results don't actually reflect most of the people who answered in the surveys actual views of the world Editor’s note (27th March, 2024): After this article was published, the Pew Research Centre conducted a study on this topic. It found that young respondents in opt-in online polls such as YouGov’s were far more likely to say the Holocaust was a myth than were those surveyed by other methods, and that in general, young and Hispanic participants in such polls are unusually prone to providing “bogus” answers that do not reflect their true views.