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.
Which brings to question, why the genocides of the concentration camps are quite deliberately reduced to the holocaust in many perceptions.
The German government denied adequate compensation to LGBT concentration camps survivors to this day and only in 2017 they opened for legal rehabilitation. So until 2017 someone that was convicted for homosexuality by the Nazis and put into a concentration camp was considered a convict.
Equally political activists, Sint and Roma and disakled people (or people ascribes as being so) faced similiar issues of non recognition and non compensation.
And it is no surprise that the option for homosexuals was only opened when almost all the surviving victims have died of old age. Focusing the spotlight on the Holocaust was done to deflect from the continued discrimination and subjugation of other victim groups.