So, Reformers say that "God from all eternity, did, by the most wise and holy counsel of His own will, freely, and unchangeably ordain whatsoever comes to pass; yet so, as thereby neither is God the author of sin"...Westminster Confession of Faith (1647) Just saying so don't make it so.
It really is just plain nonsensical double-talk. If God unchangeably preordained whatsoever comes to pass then that whatsoever is whatsoever, everything, all of it... Then leaving sin out detracts from this whatsoever, everything all of it and makes it more of a not everything situation. Amazing the writhing and contorting that reformers have to go through to circumnavigate logic to say that everything is not everything but yet it is everything. We may some if this in the comments that may follow.... I assumed this nonsense to be so in my own walk for decades because it was constantly preached to me for years until. It wasn't until I started questioning this fallacious logic in light of God's Word that I finally accepted God's word on the matter over Calvin's. There is such freedom in taking God at His Word!