See the original post (and jw.org source page) on this one. On that same page adjacent to the 1919 date are the following 30 additional item that happen on that date. Are we supposed to abandon these as well?
1919,
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144,000 begin “singing as if a new song” (Re 14:3): re 200
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Babylon the Great falls (Re 14:8; 18:2): re 205-206, 209, 259-261; w89 5/1 3-5; w88 12/15 20-21
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birth of new nation (Isa 66:8): w14 11/15 26; re 183-184; ip-2 397-400; w94 1/15 14
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‘disgusting thing placed’ (Da 12:11): dp 300; w93 11/1 10-11
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dry bones come to life (Eze 37): w16.03 30-31
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“faithful and discreet slave” ‘appointed over master’s domestics’ (Mt 24:45): kr 23-24; w13 7/15 21-22; w13 12/15 16
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‘fire hurled to earth’ (Re 8:5): w09 1/15 32; re 131-132
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flight to “valley of my mountains” begins (Zec 14:5): w13 2/15 19-20
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‘four angels untied’ (Re 9:15): re 149-151; w88 12/15 13
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harvest actually begins (Mt 13; Re 14): kr 88-89; re 211-212
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Jehovah’s chariotlike heavenly organization gets in touch with Ezekiel class (Eze 1): w91 3/15 11
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Jehovah’s spirit begins to be poured out on remnant (Joe 2:28, 29): w98 5/1 14-15
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“key of the house of David” placed on shoulder of remnant (Isa 22:22): w09 1/15 31
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locusts swarm from abyss (Re 9): re 143-148; w89 4/1 17-18; w88 12/15 12-13
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once held to be year “faithful and discreet slave” ‘appointed over master’s belongings’ (Mt 24:47): w04 3/1 12; wt 131
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once held to be year faithful slaves ‘appointed over many things’ (Mt 25:21, 23): w15 3/15 24; w04 3/1 17
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once held to be year virgins hear cry, “Here is the bridegroom!” (Mt 25:6): w15 3/15 14; w04 3/1 14
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“opened door” set before remnant (Re 3:8): re 60-65
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remnant “come quivering to Jehovah” (Hos 3:5): w91 8/15 17
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remnant eat “little scroll” (Re 10:8-11): re 159-160
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remnant figuratively resurrected: dp 290-291; w88 10/15 13; w87 7/1 21-23
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remnant freed from Babylon the Great: w16.11 30; ip-2 74; ip-1 400-401; w89 5/1 4-5
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remnant ‘hold possession of land’ (Isa 60:21): w02 7/1 18; ip-2 319-320
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remnant refined (Isa 1:24-27): ip-1 32-34
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remnant restored to spiritual paradise: ip-1 380; w91 5/15 16
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remnant step before “waters” of mankind (Jos 3:15-17): w86 12/15 13
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two witnesses resurrected (Re 11:11, 12): w14 11/15 30; re 169-170
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“Way of Holiness” opened (Isa 35:8): ip-1 380-381; ws 132-134
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“your God has become king” begins to be declared (Isa 52:7): ip-2 187