This makes no sense at all. It is speculative at best. Firstly, the premise is Lord Jesus has no fixed date. Granted. Then, it is surmised that We Humans can in fact influence the date of the second coming of our Lord.
A contradiction. If there is no exact date written in stone how can anything humans do influence a deviation from a date that does not exist?
In order for human behavior to influence the Lord there must be a point in time to be influenced.
Personally, I don’t believe that any human today can influence the Lord God or the Lord Jesus.
A fellow I once read made the cogent observation that God is the Initiator and man the Responder.
I disagree with that premise. God is omniscient - He knows the end from the beginning even before it all came into existence. I don't see it as a contradiction. The first Christians were watching and waiting for the return of Christ and have been for 2000 years. What the article examines is how God uses us to further His kingdom as all the pieces line up for the end times.
That verse has especially intrigued me for a while now and I'd like to hear other's ideas about what is meant by us "hastening the coming of the Day of God". That word was used for a reason. The Lexicon has this: https://biblehub.com/greek/4692.htm. It can mean to "desire earnestly"; "to urge on" (diligently or earnestly); by implication, to await eagerly; to hasten.
Thanks for your comments.