This is one of the most stupidest teachings the WT Corp has ever come up with and they have a LOT of Dumb teachings. Even when I was a young lad and was deep into the mind control (I was a born in and I actually believed most of their horse shit) the whole 1919 thing didn't make any sense and it triggered a Lot of doubts along with some other ridiculous belief's.
1919 is just some made up BS so that the FDS and GB can have some connection to the scriptures and give credibility to their Authority. A person would have to be a complete Dunder Head to believe this one.