That’s an old falsehood that dies hard. For a good history of rapture teaching see:
http://www.midnightcall.com/articles/prophetic/A-Brief-History-of-the-Rapture.html
sorry, what is called the “pre-trib rapture” was unknown before the 19th century. the Catholic Church ( Latin and Greek ) has always taught Jesus will return once at the end of the world and then it will be Judgement Day. No seven year tribulation period, the article you linked to doesn’t cite any. the tribulation period will be the great falling away or apostasy hitting the Church, look around, evidence abounds!!