Well, I stumbled on an actual quote from that 1930 article in the Golden Age. It reads:
"If it's true that Jesus has been present since the year 1914 then it must be admitted that nobody has seen him with his natural eyes"
I can't read the broader context of the article, it seems ambiguous. it can either be part of an apology or a rebuttal.
In any case, the same Golden Age magazine, in 1934, p.379, 380 is clear:
"(...) An examination of the scriptures containing the word parousia shows that the presence of the Lord could not date prior to 1914"
However, there seems to have been another reversal, for 3 years later in the book The Harp Of God, they go back to 1874:
"Applying the same rule, then, of a day per a year, 1355 days after 539 AD brings us to 1874 AD, at which time, according to Biblical chronology, the Lord's second presence is due" and "It was in the year 1874, the date of our Lord's second presence (...) - The Harp Of God (1937) p.235, 240
THEN, in 1943, with the book "The Truth Shall make You Free", it appears that the definitive (well....not quite definite as it seems now) change to 1914 was made.
Eden