Did Rauch Teach Najdorf to Play Blindfold?

Alekhine giving a blindfold display, Paris, 1925. Credit: www.blindfoldchess.net 

Miguel Najdorf (1910-1997) was, as is well known, extremely talented in blindfold chess, setting the world record twice (1943 -- 40 opponents, 1947 -- 45 opponents) in Argentina.

Surprisingly, it might be that he learned the "trick" from Meir Rauch (1909--?), a Palestinian (later Israeli) player who, like Najdorf, had been stranded in Argentina in 1939 when WWII broke out in Europe, being part of the Palestinian team (1st reserve board). Our frequent correspondent Moshe Roytman brings to our attention two articles in the Israeli press:

Ma'ariv, Sept. 28th 1956, p. 7:

"Blind" Fate

In the "Fil" shoe store in Allenby St. in Tel Aviv, works a short, thin clerk -- Meir Rauch. This modest man is the father of a world record, achieve through fun and entertainment. 

In 1939 our chess team travelled to the chess Olympiad in Argentina. In the meantime the war broke out and many players were stranded there after the Nazis overran their countries. Among those was the Warsaw player Mendel Najdorf, who played for Poland. He won the "second homeland"'s championship a few times and, in gratitude, changed his name to "Miguel". This ambitious Jew decided to make a name for himself in chess, and if he can't be world champion -- to at least be a champion in blindfold chess. He did not then know the technique of this game, where the player competes with his opponents without looking at the board. He learned it from the Israeli player Rauch, our champion in this field, who long ago played against 18 opponents blindfold in Germany.

Najdorf learned quickly and, between tournaments, would train himself in blindfold chess, Soon the pupil overtook his Israeli master and set a world record playing against 45 opponents at one time, considering 45 different plans without looking at the board.

Rauch never imagined the fun he had with Najdorf would give birth to a world champion in this field. Now there are two world champions. Now there are, in the two poles, two Jews: a communist Jew -- Dr. Mikhail Botvinnik, the world chess champion, and a Jewish "capitalist", the world champion in blindfold chess, Mendel, Miguel Najdorf.

In Ma'ariv, Dec. 30th, 1960, p. 12, Shaul Hon summarizes this story in one paragraph in an article about Najdorf (on the occasion of his visit to Israel), adding that Rauch is a member of the Reti chess club in Tel Aviv, and also holds the Israeli record for a blindfold simultaneous game (8 players, at the time).

The 1956 story, notes Roytman, seems somewhat "puffed", giving to Rauch as much credit as possible, i.e., in claiming that Najdorf didn't know how to play blindfold chess at all before training with Rauch, which seems unlikely. I add it is has some obvious inaccuracies:

1). It is unlikely Najdorf changed his name to Miguel out of gratitude to Argentina, as opposed to the immigrants' age-old custom of changing a name to one that fits with the new country's culture.

2). There is, of course, no such thing as the "world blindfold champion". If the phrase is used loosely to mean holding the world record in the number of opponents played simultaneously, Najdorf's motivation was (as noted here for example) to notify his family in Europe of his whereabouts.

Is anything more known, however, about the Najdorf / Rauch connection in relation to blindfold chess?