I get what you're saying, that it appears that the Society's change from 1919 to the Great Tribulation went over the heads of all folks, JWs and ex-JWs.
And, yes, I'm also certain that most -- even here -- missed its significance. Yes, I believe it's a significant change on their part.
But not all missed it. When that article appeared, poster Legacy brought it to our attention some 3 years ago in the topic, "
July 2013 WT Sunday ? Who is now the FDS ?
at the following link:
https://www.jehovahs-witness.com/topic/260965/july-2013-wt-sunday-who-now-fds?size=20&page=1
Keep on truckin!
Len Miller
ps: Your Mandela Effect theory may have been too much of a distraction to the bulk of your audience to get engaged in such an important Watchtower change. Just sayin'.