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I have not been able to find the letter that is referenced in the article. However, that does not render the magazine useless, nor of little weight. Being unable to find it moreover, does not mean it is non-existent. Many important docuмents throughout history have been lost, destroyed, buried, etc. The internet can give us a lot, but it cannot give us everything

Hence, it is a publication well-known by the Archbishop, and he deemed it trustworthy enough to have his own name associated with it. All of the editors were priests, too.
These issues contained news, and pious and theological articles. It was a way to console and inform traditional Catholics, during a time when the SSPX was not infiltrated with modernists.
I do not see any reason why we should say the testimony of the article in question would have been given with a desire to deceive, or an ability to be deceived, considering the high reputation of this magazine, and the learned and pious people running it. Additionally, reading the whole issue helps one to understand the context in which certain things were said.

No.  You act like a snake who bites in the middle of the night and then quietly slithers off.  You spread unproven calumnies and then don't want to debate.  You are scuм.