I didn't realize he was ever Reformed.
Christian Reformed Church. Off the rails in '89, IRRC. G00gledy googledy...Robert Godfrey, The End of the World According to Harold Camping, part 1 and following, gives some of the history of that.
Chris Gordon, JUDGMENT DAY, MAY 21, 2011? - HAROLD CAMPING & The UNTOLD STORY , on Camping's discipline and removal from teaching by the Alameda CRC. Very coincidentally, Camping dates the removal of the Holy Spirit that approximately that date.
So it's not just dispensationalists that get their eschatology whacky.
Doomsday predictors and Rapture Preppers focus ridicule on the Body of Christ. My former pastor fell into terminal end times focus.
Eschatology is a much broader subject than most think.