"Any suggestions for discussion related on the above? "
If he is a real anointed , he should believe Jesus Christ words !
There is no place for such interpretations and calculations which leads toward years like 1914, 1918, 1925, 1975 ... in Bible .
--- After studying the Bible I came to see/realize that God have ever known that He wrote regarding ancient events in an “hidden way”( Proverbs 25:2 ),
and so, He didn’t command to his worshipers to find the real/exact chronological data of events of human history (or about its empires and states from Adam until today)
in case He would command this , knowing how difficult is to come to a conclusion in chronology and how much time it requires , then God’s worshipers would be called “historians” not “Christians”
Please have the courage to present to him this material.
and if possible also this one .
Greetings .