For people who want free discussion, you don't seem to take kindly to the answers.
1. The 271k doesn't include 4 out of the 5 extermination camps (Treblinka, Belzec, Sobibor, or Chelmno). For Auschwitz, it only covers registered deaths from mid 1941-1943.
2. The 6 million wasn't calculated from the 4 million. Also it was 4 million people, not Jews (fun game, find on the plaque where it specifies Jews).
3. Why did Hitler ban Jewish emigration in Oct 1941?
4. The chambers had gas-tight doors and ventilation. We have the work reports and records.
5. Why did the SS destroy these to begin with? Especially spending their last few days doing it? What were they hiding?
6. Remains have been found. Belzec has 33 mass graves full of ash and burnt bone.
7. Cyanide was found in the gas chambers, with 0 in the controls in the living quarters. Blue staining more often than not doesn't follow exposure.
8. Understand denominators. 3 million was the most frequent "million" headline num associated with Jews in headlines from 1900-1939.
9. What does a fire reservoir in Auschwitz I have to do with genocide in Auschwitz II?
10. The chimney is in wartime photos.
11. The alanac used the same data source from 1938-1948. Why is a static dataset proof of population not changing?
12. It's illegal to deny the cambodian, armenian, and rwandan genocides. Did those happen?
13. 6 million isn't the num killed in gas chambers. It's the total, inclusive of mass shootings, starvation, disease, and so on.
14. Goebbels discussed the mass killing in his journal on March 27, 1942. He wrote that 60% of the Jews deported from the GG would be killed and 40% would be used for forced labor.
15. Reinhard deportees weren't housed or fed. It took 2-3 hours from arrival to burial.
16. The British intercepted reports of mass shootings, and transit records to the Reinhard camps.
17. The killing camps were in the most efficient spot possible, at the centroid of Jewish population in Europe.
18. Zyklon was used to murder prisoners in Mauthausen. It was also used at Natzweiler-Struthof.