I can't see how any chronology, much less totally wacky chronology is an indication of anything. I don't recall Jesus saying his true disciples would be identified by their chronology.
No, they have the truth because truth has been redefined to mean "present understanding". That's why they had the "truth" in 1919 so as to be appointed as the Faithful Discreet Slave, and they still have the "truth" today, even though the "truth" of 1919 hardly matches that of today.