I have, yeah. The only historical revisionism regarding the Holocaust I take seriously is regarding the numbers who died. I don't take historical revisionism based on outright Holocaust denial seriously, though I have studied the counter-narratives by those who believe these theories. The idea that it never happened, that death camps didn't exist and millions of Jews, Slavs, Romani people, homosexuals, political dissidents and persecuted religious groups weren't executed by the Nazi regime is a conspiracy theory that in my opinion is false. The evidence from testimonies of both survivors of death camps and work camps and the guards that worked there is sufficient to prove they existed. The evidence of the 'Final Solution to the Jewish Question' is proven by documents issued by high-ranking Nazis like Himmler, Eichman, Rosenberg, Heydrich, Goering, Goebbels and Bormann. The culpability is divided into two stages: the SS death squads on the Eastern Front committing war crimes against Russians, Russian Jews, Baltic Jews and others and then the state-sponsored deportations of Polish, German, Austrian and French Jews to concentration camps. The methods of execution started off as crude executions by the hundreds by gunshot in ditches then German chemical corporations started producing Zyklon-B in mass quantities to be used in death camps like Auschwitz and Treblinka. Testimonies from employees and employers at German chemical companies, train drivers into Auschwitz, guards at the Nuremberg Trials etc. provide enough substantial evidence to prove the Holocaust occurred and millions were exterminated.