The video is available here.
First, a quick historical intro. The video deals with the gas chamber at Auschwitz I, the so-called main camp.
This small makeshift gas chamber was adapted from a morgue in the crematorium I of the main camp in late 1941. The gassings here were occasional, it's unlikely that more than 10000 people were gassed in this chamber in total, the main killings took place in Auschwitz-Birkenau since early 1942, first in two peasant houses whose rooms were converted into makeshift gas chambers; then in the 4 big crematoria completed in the early 1943.
Crematorium I was converted into an air-raid shelter by the Nazis in late 1944 (to repeat, the killings at that time took place in Birkenau and in late 1944 were coming to an end anyway). The main modifications were documented by the Nazis themselves, so we know that the morgue/gas chamber was divided into 4 smaller rooms. After the war the authorities tried to reconstruct the original look of the crematorium but botched the job in several ways. The most important mistake was knocking down one wall too many: as they were removing the recently installed air-raid shelter walls of the small inner rooms, they also removed the wall between the morgue and the former washroom (hence the visible toilet drains, which originally were in the washroom).
Given that it was tampered with by the Communists (though not with a provable ill intent), the reconstructed small gas chamber in the main camp is in its current state not a "proof" of the gassings by itself. However the presence of the HCN residue in the original remaining walls of the gas chamber is highly suggestive and certainly corroborates the witness testimonies.
The video deals with misrepresentations of the gas chamber state by some people (incl. tour guides) in the video, but that is frankly irrelevant to the historicity of the Holocaust. We have the original documents and other sources and can examine the evidence for ourselves. Misrepresentations by third parties will always be there about any significant historical event, this does not mean they call these events into doubt. Also, nowadays the Auschwitz Museum is very explicit about the gas chamber having been reconstructed. Representation and misrepresentation of facts by museums is, of course, a fair and important topic to discuss. But not with the dishonest individuals who would spin such a discussion into a denial of history.
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