It is a phrase suggesting frustration.Please elaborate.
The OP is trying to determine why the transformers failed. The first (of 2) was energized, until it failed.
Why might that be?
You stated, "The spare transformers need to be kept energized...". You further put forth the suggestion that it is a widespread industry practice to energize spare units. It has been suggested by several members here, and even written in one of the links you provided, that the unused transformers are generally expected to be left de-energized, with relatively few exceptions.
In post #30 you felt that a perfectly reasonable question was a "put down" to Design Engineers, without addressing the issue at hand. In post #28 you seemed to suggest that the logic of conflicting information (links provided by yourself) might be overruled by what one wanted to see.
I felt it had become difficult to move forward on an exploration of the original cause of failure in this thread, thus my comment.