No doubt Tim Staples at one point did believe in the Rapture. His failed Protestantism has, sadly, obligated him to swallow whatever the magesterium proclaims at any point of time. St. Paul was who revealed the mystery of the Rapture of the church before the Tribulation. It’s not as if nobody ever heard of such a thing before the Reformation!
Maybe he was never anything more than a PINO. Remember 1st John 2:19.