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But even if the Vrba-Wetzlar report was completely made up, I don't see how the War Refugee Board document you linked to would be evidence that the Holocaust is a hoax.
It's known (I think) as the Vrba-Wetzlar report now, at the time they were 'anonymous'.
Here is where you have to clarify your thinking, there are two separate subjects,
1. what really happened during WW II in the camps, etc.
2. the creation of the hoax that Jews were being exterminated in the camps
Topic 1 - So, we can review the evidence of what really happened in the camps, and there is no shortage. Of course none of it save 'testimony' supports the extermination of Jews. So there unlimited physical evidence and documentary evidence showing that the was no extermination of the Jews. But that is not what I am demonstrating now.
Then there is topic 2 - why does every believe that the Jews were exterminated? This is a separate topic and it is what I am demonstrating now.. and there is again no shortage of evidence, a hoax was created using documents like the Vrba-Wexler report. It is direct evidence of the hoax. This IS the hoax. That is what a hoax is, bogus documents, phony testimony, etc. Then, endless propaganda. Endless legal proceedings, prosecutions, etc. And, we see how Zionists operating independently of the rest of the US govt. engineered the hoax - the Vrba-Wexler being the culmination of years of effort and a major victory for the Zionists. We can see the actual construction of the hoax and how it became the basis of US policy. Then you can proceed to the Nuremberg trials, where Zionists controlling the War Refugee Board and the War Crimes Branch, offices in the US govt, determined US policy in the trials and perpetrated the hoax. This is all done, naming names, etc., in Butz's book 'The Hoax of the Twentieth Century'.
Look at it this way - in the US govt you had the military, military intelligence with innumerable contacts on the gound, overflights, contacts with other militaries, you had the state department with its unlimited contacts, etc., etc, and these people thought the holocaust was a hoax, as evidenced by all the evidence including the communication shown on the page previously linked. Then you had this small Zionist office in the govt issuing a report with no evidence whatever, and that document became the basis of US policy. At that point the hoax gained enormous credibility, it became 'true' based on the authority of the US govt, with absolutely no evidence. See?