So, how does this "hoax" work, anyway?

In the narratives, every shower block has been turned into a gas chamber (Mauthausen & Dachau); there is evidence of post war reconstruction of the blocks to make them appear lethal.

It is just a matter of coincidence that the extermination camps just appear in Post War Soviet territory and no where else.

If the Soviets had not gone over the Bug we can be assured that Treblinka and Sobibor including Belsen would have been reprieved of the ignomy that now surrounds them.

The Mauthausen gas chamber was apparently for limited gassing for Aktion14f13 and not for Jews. Still there was a drainage hole in the middle of the floor. This is all backed up by legal sanctions, whether it is true or not.

NESSIE wrote
“What you are dodging is...” blah, blah, blah

Hilda Shlick thought she lost nearly all her family in the Holocaust — until her Internet-savvy grandsons located her 81-year-old brother in Canada. 
“After 65 years, I have found the sister who I love,” Hilda’s brother Simon Glasberg said.

Using the database of Holocaust victims at Yad Vashem, Israel’s Holocaust memorial, two of Shlick’s grandchildren, Benny and David, began unearthing a mystery spanning six decades and three continents.

...improved technology in recent years has made the task of tracking Holocaust survivors easier. 
Scanning the database, the grandsons, both in their 20s, discovered an entry erroneously stating their grandmother had perished half a century earlier.

...The last time the two saw each other was in 1941, when the Glasberg family of Chernowitz, Romania, was separated after the country was invaded. Hilda, then 10, escaped to Uzbekistan with her older sister Bertha. The rest of the family — parents Henia and Benzion, and brothers Simon, Mark, Karol and Eddie — stayed in Romania. The fate of one sister, Pepi, remains unknown. She disappeared and is presumed to have been killed by the Nazis.

In 1998, Shlick immigrated to Israel. During a family conversation this summer, her grandsons learned her maiden name was Glasberg, and they began to investigate her past.

They logged onto the Yad Vashem Web site and found a page of testimony submitted in 1999 by her brother Karol, of Montreal, who wrote about his sister Hilda, who “perished in the Shoah.”
Karol died that same year, but further searches through the Web site of the Montreal Burial Society and online forums of survivors of Chernowitz, Shlick’s grandsons were able to track down his son, who filled in the picture of what happened to the divided family.

Mark Glasberg lives in Ottawa, but was too ill to travel to Israel to meet his sister. His son Irving, however, lives in Israel, just half an hour away from his missing relatives.

 www.nbcnews.com/id/wbna14896842

 ”...All her life, Hilda mistakenly thought that her family members who remained in Romania were murdered in the Holocaust.”
 
 www.ynetnews.com/articles/0,7340,L-3305554,00.html 

Holocaust siblings meet after 66 years

A frail Irene Famulak clutched her brother on the airport tarmac, her arm wrapped around him in a tight embrace, tears streaming down their faces. It was the first time since 1942 they had seen each other, when she was 17 and he was just 7.
...Both siblings survived the Holocaust and grew up on different sides of the Iron Curtain, not knowing the fate of the other.

...Famulak said she spent World War II in a labor camp in Munich, Germany, working in the kitchens. She had been taken to the camp with her older sister. When it was liberated in 1945, Famulak stayed in Germany for several years, eventually emigrating to the United States in 1956.

She never saw her parents again after that day in 1942 when she becamd separated her from her family. She and her brother still have no idea what happened to their mother and father. Some of their siblings lived through the war, but later died; others, they never heard from again after being separated... her younger brother, too, was sent to a German labour camp. 

Under Soviet leader Josef Stalin, information on lost relatives was kept sealed, and Galezkij said it wasn't until reforms in the late 1980s, followed by the Soviet collapse, that he started making progress in finding his sister. Even then, it took him more than 17 years to locate her in the United States.
Linda Klein, the director of the American Red Cross Holocaust and War Victims Tracing Center, said the group has reunited 1,500 families since it began work in 1990. She said the former Soviet Union released records in 1989 of concentration camps it liberated, greatly helping organisers find information on Holocaust victims.

 edition.cnn.com/2008/WORLD/europe/07/11/holocaust.reunion/index.html

Two pairs of Polish Jewish siblings, who each believed their entire families died in the Holocaust, met for the first time at the Yad Vashem Holocaust museum in Jerusalem. 

www.haaretz.com/israel-news/cousins-who-thought-family-perished-in-holocaust-reunited-in-israel-1.5474195