Could they be referring to coming out of Christendom as it were ?
Of course they were. Everything except WT is "Satan's organization". The world empire of false religion includes Christendom.
The other laughable part of the quote above is this:
"... it began its fulfillment in the year 1919 when the remnant of spiritual Israel came out of Satan’s organization and started earnestly looking for Jehovah and his goodness."
Uh, WT's whole argument is that they already had to be doing this up to and including 1914 when Jesus began inspecting all the religions of the world to determine which one would operate his publishing, pedophile protection and real estate development empire.
CT Russell taught that Armageddon was coming in 1914, so obviously qualifying as Jesus' CEO would require that his organization had all their ducks in a row prior to the big global sweep-up day. WT revised all the pre-1914 events to aplly after 1914 when all of CTR's predictions failed.
How is it that WT didn't even begin to search for Jehovah until 1919, yet Jesus already allegedly approved of them four years earlier? Furthermore, WT claims that Jesus' approval had fallen on CT Russell in the 1876-1879 period to "revive long-lost Bible truths". By WT's claim it, and it alone, was the only group that was paying attention and looking to 1914, and it was the only group "announcing Jehovah's Kingdom".
The above quote implies that WT was NOT looking for Jehovah or his goodness for the first 40 years of it's existence. So, why would Jesus approve of them more than any other religion???