The most famous forms of Holocaust denial and revisionism tend to focus on Jews, casting doubt, for example, on how many were exterminated in the camps. But denying the impact the Nazis had on the other groups they targeted, including queer and trans people, disabled people and Romani people, is still Holocaust denial. Maybe someone should tell J.K. Rowling.
No, the freedom was instant. There may have been logistical issues with medical treatment of the now free people. In all my conversations with Holocaust survivors, I have never heard one say that they were not free after the camp was liberated. That is just a nonsense take.
Then you know better than I.