That "conclusion" is simply a mechanism used by those who deny that the entire Word of God is inerrant and factual, including and especially the book of Thessalonians since the description God gave of the Rapture is in that Book, and is merely a tool to attempt to discredit those of us who accept and believe every word of Scripture, including the promises made by Christ to remove His Church before He judges a wicked world.
It sinks like a lead balloon of course since nobody who believes what Christ says about the Rapture sets dates for that event.
Those who accuse others of date setting based on our belief in what Christ commanded us to do - look for and recognize the signs He gave for His return - are the same people who discard most of the Bible, since approximately two-thirds of Scripture is prophecy- and therefore have exactly zero credibility in these discussions and are not to be taken seriously whatsoever.
INDEED!
AMEN, SISTER, PREACH IT!