Did we have an online in 1918 when that book by Larkin was published ? Plus the work published by the Jesuit Luis Del Alcazar, was in 1614, and was rejected at that time.This story of the origin circulated online is debatable.
The early church knew of the fulfilled words of Christ Jesus but just like the Gospel it did not take long for it to be oppressed.
“The Historical Basis of Preterism,” Greg Bahnsen and Kenneth Gentry demonstrate a “Nascent Preterism in Antiquity.”
So there are early church writers who writing about first century events.
Not saying you are wrong about the early church writers, but it isn't a story that originated online.